WO2016095375A1

WO2016095375A1 - Mobile terminal and dtmf-based session authentication method therefor

Info

Publication number: WO2016095375A1
Application number: PCT/CN2015/076458
Authority: WO
Inventors: 谢芳
Original assignee: 捷开通讯(深圳)有限公司
Priority date: 2014-12-17
Filing date: 2015-04-13
Publication date: 2016-06-23
Also published as: CN104580652B; CN104580652A

Abstract

Provided are a mobile terminal and a DTMF-based session authentication method therefor. The session authentication method comprises: detecting whether an authentication mode is started up or not; automatically acquiring verification request information stored locally; transmitting the verification request information to a calling party via the DTMF, and receiving verification key information looked up by the calling party according to the verification request information and fed back via the DTMF; performing verification authentication on the key information and a key stored locally; and when the verification authentication is passed, accessing an inbound session. By means of the method of setting the authentication mode and by automatically transmitting verification via a DTMF, the method is convenient for a user to operate and use.

Description

Mobile terminal and DTMF-based session authentication method thereof

【技术领域】[Technical Field]

The invention belongs to the field of session authentication technology, and particularly relates to a DTMF based (dual-tone multi) A session authentication method for frequency, dual tone multi-frequency, and a primary caller and a called party mobile terminal using the authentication method.

【背景技术】【Background technique】

In the prior art, with the gradual popularization of mobile terminals, users use and contact mobile terminals for longer and longer, and the frequency is getting higher and higher, and some of them have seriously affected the daily life of users.

For example, during non-working hours, users do not want to be disturbed by excessive ordinary calls, messages, or emails. Therefore, they are forced to adopt new mobile terminals or numbers during non-working hours; some users will set them up. Blacklist form, but this method is not flexible, and it needs to be set up repeatedly. It may also mask the necessary list and miss it when necessary, causing certain troubles and troubles.

In addition, in the technical field, CN200710015787.9 discloses a telephone encryption anti-harassment device, specifically, a circuit structure is arranged at the terminal of the telephone, and the circuit structure includes a detection circuit, an audio decoding circuit, a single-chip microcomputer, etc. When entering, the circuit structure first starts to work, and prompts the caller to input the password. When the password is correct, the phone can be connected to the phone. After the access, the phone will start the ringing and other prompt signal devices. Then, it is not difficult to see that the telephone encryption anti-harassment device requires the caller to manually input the password, and the access process is complicated, and also interferes with the user's use to a certain extent, and the use experience is poor.

【发明内容】 [Summary of the Invention]

In view of this, the embodiments of the present invention provide a mobile terminal and a DTMF-based session authentication method, which can effectively improve the user experience, intelligently and flexibly implement automatic management of the session, and avoid excessive conversations to interfere with the daily life of the user. .

To solve the above technical problem, the embodiment of the present invention provides a DTMF-based session authentication method, where the session authentication method includes: when the mobile terminal receives a session incoming call, it detects whether the authentication mode is enabled; When the authentication mode is enabled, the comparison request information stored locally is automatically acquired; the mobile terminal sends the comparison request information to the primary calling party through DTMF dual tone multi-frequency, and receives the primary calling party according to the comparison. The request information is searched for and passed the comparison key information fed back by the DTMF; the mobile terminal performs the comparison authentication with the stored key information; when the comparison authentication passes, the movement The terminal accesses the session incoming call, and rejects or ignores the session incoming call when the comparison authentication fails.

Before the step of detecting, by the mobile terminal, that the authentication mode has been enabled, the mobile terminal includes: setting, by the user according to the time interval of the user, setting according to the location of the space, or setting the time of the week according to the manner of the user. The authentication mode is turned on.

Among them: setting the authentication mode according to the daily time period includes: turning off the authentication mode during the day and turning on the authentication mode at night, or turning on the authentication mode from 22 to 7 hours; setting the authentication mode according to the spatial location setting includes: closing at the workplace In the authentication mode, the authentication mode is enabled at the residence, or the authentication mode is turned on when driving. The authentication mode is set by the weekly time: the authentication mode is turned off from Monday to Friday and the authentication mode is turned on from Saturday to Sunday.

The session authentication method further includes: when the mobile terminal performs the session call, detecting and receiving whether the called party has the comparison request information sent by using the DTMF; and when detecting the comparison request information, the mobile terminal Searching for the comparison key information locally according to the comparison request information; the mobile terminal feeds the comparison key information to the called party through DTMF, wherein the comparison key information is used by the The called party performs a comparative authentication with its local key to implement the session outgoing call when the authentication is passed, or the session call fails when the authentication fails.

The step of the mobile terminal feeding back the comparison key information to the called party by using DTMF, comprising: the mobile terminal encrypting the comparison key information, and transmitting DTMF feedback after encryption Give the called party.

In order to solve the above technical problem, the embodiment of the present invention further provides a mobile terminal, where the mobile terminal includes: a detecting module, configured to detect whether an authentication mode is enabled when a session incoming call is received; and an acquiring module, configured to: When detecting that the authentication mode is enabled, the comparison request information stored locally is automatically obtained; the transceiver module is configured to send the comparison request information to the main calling party by using DTMF dual tone multi-frequency, and receive the main call. The party searches for and passes the comparison key information fed back by the DTMF according to the comparison request information; the authentication module is configured to perform the comparison authentication on the comparison key information and the key stored in the local; the session module uses When the authentication is passed, the session incoming call is accessed, and when the authentication fails, the session incoming call is rejected or ignored.

The mobile terminal further includes: a setting module, configured to enable the authentication mode according to a user setting according to a daily time period, setting according to a spatial location, or setting a weekly time.

The setting module is specifically configured to: set the open authentication mode according to the daily time period, including: turning off the authentication mode during the day and turning on the authentication mode at night, or turning on the authentication mode from 22:00 to 7:00; The authentication mode is enabled: the authentication mode is turned off in the workplace and the authentication mode is turned on in the residence, or the authentication mode is turned on in the driving position; the authentication mode is set according to the weekly time: the authentication mode is turned off from Monday to Friday and is in the Saturday to the week. The authentication mode is enabled on the day.

In order to solve the above technical problem, an embodiment of the present invention further provides a mobile terminal, where the mobile terminal includes: a transceiver module, configured to detect and receive, when a session is called out, whether the called party has a comparison sent by DTMF. a requesting module, configured to search for the comparison key information locally according to the comparison request information when the comparison request information is detected; the transceiver module is further configured to: use the comparison key The information is fed back to the called party by DTMF, wherein the comparison key information is used for the called party to perform a comparative authentication with its local key to implement session exhalation when the authentication is passed, or The session call fails when the authentication fails.

The transceiver module is specifically configured to: encrypt the comparison key information, and feed back to the called party through DTMF after encryption.

With the above technical solution, the beneficial effect of the embodiment of the present invention is that, when the authentication mode is enabled, the mobile terminal can automatically feed back the comparison request according to the authentication mode without the user manually inputting the operation, and at the same time, on the primary calling party. After the authentication is enabled, the session can be accessed. When the authentication mode is enabled, some unnecessary session calls affect normal work and life, thus effectively improving the user experience. In the embodiment of the present invention, the authentication mode is set, and the DTMF is automatically sent and verified at the same time, which is convenient for the user to operate and use, and brings convenience to the user.

【附图说明】 [Description of the Drawings]

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments will be briefly described below. It is obvious that the drawings in the following description are only some embodiments of the present invention. Other drawings may also be obtained from those of ordinary skill in the art in light of the inventive work.

1 is a flowchart of an embodiment of a DTMF-based session authentication method according to the present invention;

2 is a structural block diagram of an embodiment of a mobile terminal employing the session authentication method shown in FIG. 1;

3 is a flow chart of another embodiment of a DTMF-based session authentication method according to the present invention;

4 is a structural block diagram of another embodiment of a mobile terminal employing the session authentication method shown in FIG.

【具体实施方式】【detailed description】

The technical solutions in the embodiments of the present invention are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present invention. It is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present invention without creative efforts are within the scope of the present invention.

Referring to FIG. 1, FIG. 1 is a flowchart of an embodiment of a DTMF-based session authentication method according to the present invention. In this embodiment, the session authentication method includes but is not limited to the following steps.

Step S100: When receiving the session incoming call, the mobile terminal detects whether the authentication mode is enabled.

In step S100, for example, most users prefer not to turn off the mobile phone at night, fixed mobile phone and other mobile terminals to rest, if a phone call is suddenly entered in the middle of the night, the result is that the harassing call will seriously affect the user's rest and sleep; If the mobile phone is turned off, many users will miss important calls due to work requirements. Therefore, this embodiment adopts the set authentication mode to implement incoming call management for the session.

Further, before the mobile terminal receives the session incoming call, before detecting whether the authentication mode is enabled, the mobile terminal in this embodiment may be set according to the daily time period of the user, according to the spatial location setting or the weekly time setting. The way to open the authentication mode.

Specifically, setting the authentication mode to be set according to the daily time period includes: turning off the authentication mode during the day and turning on the authentication mode at night, or turning on the authentication mode from 22:00 to 7:00. Of course, in other embodiments, the specific time period and time point can be set by the user, for example, the authentication mode can be automatically turned on at 7 pm.

Turning on the authentication mode according to the location of the space includes: turning off the authentication mode in the workplace and turning on the authentication mode when the residence is turned on, or turning on the authentication mode when driving the location. For example, the mobile terminal intelligently judges the spatial location of the current user through the GPS or the mobile network. For example, if the user is in the working area, the user is considered to be in the working mode, and the user is not required to start the authentication mode. In the residential area and other areas, the authentication mode is automatically enabled. The determination of the spatial location may be based on the overall assessment of the partial area in the cloud or the network, and will not be described in detail herein. In addition, in order to improve driving safety and avoid excessive contact with the mobile terminal during driving, it is possible to determine whether the user is in a driving vehicle, specifically, as a driver, the authentication mode can be automatically turned on to ensure driving safety. . Of course, the mobile terminal in this embodiment can also determine whether the user is in a publicly recognized vacation place, such as the Great Wall, etc., and intelligently turns on.

Setting the authentication mode by weekly time includes turning off the authentication mode from Monday to Friday and enabling the authentication mode from Saturday to Sunday. Of course, in other embodiments, the specific date can be set by the user. For example, if the user's working day is Tuesday-Saturday, the authentication mode can be started outside the non-working day, and will not be described in detail herein.

In step S101, when it is detected that the authentication mode is enabled, the comparison request information stored locally is automatically acquired.

In step S101, specifically, the embodiment may adopt TEE (Trusted execution) Environment, security zone), for example, TEE can be used The API (interface) mode implements security monitoring of session information and the like. The comparison request information may be a specific character string or the like, and is not described in detail herein.

Step S102: The mobile terminal sends the comparison request information to the primary calling party through the DTMF dual tone multi-frequency, and receives the comparison key information that the primary calling party searches for and passes the DTMF according to the comparison request information.

Step S103, the mobile terminal performs the comparison authentication with the comparison key information and the key stored in the local. Wherein, step S104 is performed when the comparison authentication passes, and step S105 is performed when the comparison authentication fails.

Step S104, the mobile terminal accesses the session incoming call.

In step S105, the session incoming call is rejected or ignored.

It should be noted that in the process of sending and receiving DTMF in this embodiment, an encrypted form may be adopted to ensure the security performance of the operation.

Referring to FIG. 2, FIG. 2 is a structural block diagram of an embodiment of a mobile terminal using the session authentication method shown in FIG. 1. The mobile terminal in this embodiment includes but is not limited to the detection module 21, the acquisition module 22, and the transceiver module 23. , the authentication module 24, the session module 25, the storage module 26, and the like.

Specifically, the detecting module 21 is configured to detect whether the authentication mode is enabled when the session incoming call is received. The session incoming call may detect the incoming call of the session for the session module 25.

The obtaining module 22 is configured to automatically obtain the comparison request information stored locally when detecting that the authentication mode is enabled. The comparison request information may be stored in the storage module 26, and may be present in the network, which is not limited herein.

The transceiver module 23 is configured to send the comparison request information to the primary calling party by using DTMF dual tone multi-frequency, and receive the comparison key information that the primary calling party searches for and passes through the DTMF according to the comparison request information. Specifically, the transceiver module 23 of this embodiment may be a DTMF module in the prior art.

The authentication module 24 is configured to perform the authentication verification on the comparison key information and the key stored in the local.

The session module 25 is configured to access the session incoming call when the authentication is passed, and reject or ignore the session incoming when the authentication fails. The session module 25 can be a prior art telephone module or the like, which is not limited herein.

It should be noted that, in order to implement the foregoing process, the mobile terminal in this embodiment may further include: a setting module, configured to enable the authentication mode according to the user setting according to the daily time period, setting according to the spatial location, or setting the weekly time.

As described above, the setting module of the embodiment may be specifically configured to: set the open authentication mode according to the daily time period, including: turning off the authentication mode during the day and turning on the authentication mode at night, or turning on the authentication mode from 22:00 to 7:00; Turning on the authentication mode according to the location of the space includes: turning off the authentication mode in the workplace and turning on the authentication mode when the residence is turned on, or turning on the authentication mode when driving the position; setting the authentication mode according to the weekly time includes: turning off the authentication mode from Monday to Friday The authentication mode is turned on from Saturday to Sunday.

The session incoming call in this embodiment may be a phone, a short message, or a third-party application phone, and is not limited herein.

In the embodiment of the present invention, when the authentication mode is enabled, the mobile terminal can automatically feed back the comparison request according to the authentication mode without the user manually inputting the operation, and at the same time, the primary calling party can pass the authentication before accessing the session, thereby avoiding the authentication mode being enabled. When unnecessary session calls affect normal work and life, the user experience is effectively improved. In the embodiment of the present invention, the authentication mode is set, and the DTMF is automatically sent and verified at the same time, which is convenient for the user to operate and use, and brings convenience to the user.

The foregoing embodiment is described by the called party. Referring to FIG. 3, FIG. 3 is a flowchart of another embodiment of the DTMF-based session authentication method according to the present invention. The session authentication method in this embodiment includes but is not limited to the following steps.

Step S300: When the session call is made, the mobile terminal detects and receives whether the called party has the comparison request information sent by the DTMF.

Step S301, when detecting the comparison request information, the mobile terminal searches for the comparison key information locally according to the comparison request information.

Step S302, the mobile terminal feeds the comparison key information to the called party through DTMF, wherein the comparison key information is used for the called party to perform the comparison authentication with the local key, so as to be implemented when the authentication is passed. The session is called out, or the session call fails when the authentication fails.

In step S302, when the mobile terminal feeds the comparison key information to the called party through DTMF, the mobile terminal may encrypt the comparison key information and feed back to the called party through DTMF after encryption.

Referring to FIG. 4, FIG. 4 is a structural block diagram of another embodiment of a mobile terminal using the session authentication method shown in FIG. 3. The mobile terminal in this embodiment includes a session module 41, a transceiver module 42, a lookup module 43, and a storage module. 44 and encryption module 45.

The session module 41 is configured to perform a session incoming or outgoing call.

The transceiver module 42 is configured to detect and receive, when the session module 41 performs a session call, whether the called party has the comparison request information sent by the DTMF.

The searching module 43 is configured to locally search for the comparison key information according to the comparison request information when the comparison request information is detected.

Then, the transceiver module 42 is configured to feed the comparison key information to the called party through the DTMF. The comparison key information is used for the called party to perform the authentication with the local key to implement the session call out when the authentication is passed, or the session call fails when the authentication fails.

The transceiver module 42 of this embodiment may be specifically configured to encrypt the comparison key information and feed back to the called party through DTMF after encryption. The specific encryption process can be performed by the encryption module 45. The storage module 44 can be used to store the comparison key information.

The session callout in this embodiment may be a phone, an information, or a third-party application phone (such as QQ voice, SKYPE voice, etc.), which is not limited herein.

In order to better understand the embodiment described in FIG. 1 to FIG. 4, a mobile phone will be described below as an example.

The TEE in this embodiment may include two modes: one is a normal mode (Normal) World), you can execute rich instructions for the REE environment (Rich Execution Environment); the other is safe mode (secure Only the trusted command, that is, the TEE environment (Trusted Execution Environment), is correspondingly the authentication mode of the embodiment.

In this embodiment, a TEE APP (TEE application) and a TEE OS (TEE operating system) can be installed in advance, where TEE The OS specifically includes secure storage and secure cryptograph, and sets information that can be authenticated and securely recorded on the TEE OS secure. The storage, or encryption of the key, can be limited to the TEE OS. In TEE OS, secure cryptograph and secure The operation call of storage takes place in the Trusted APP. The interface that the two interact with is the API of the Trusted app.

When specifically defined, Trusted The main function of the APP is to decrypt the key information sent by the main caller (which can be encrypted) to the Trusted APP through the TEE API for decryption, and store the original in the original to Secure. The local keys in the storage are compared.

The TEE API can be configured with two APIs to implement incoming and outgoing calls. The specific definitions are as follows:

Bool QualifyKey (CryptographKey) is used to check whether the encrypted comparison key information passes the authentication. The parameter CryptographKey is the encrypted key, and the return value can be set to bool. If True is returned for the authentication, False is The verification failed.

GetKey() is used to obtain the encrypted key stored locally. It can be obtained directly by the return value or by parameters.

It should be noted that, in this embodiment, the decryption function can be decrypted in the TEE, and the specific definition is as follows:

Decryptograph (CryptographKey), and the decrypted result and secure Alignment stored in storage;

Check(Decryptograph(CryptographKey), Getlocal(key)), where if it passes, it returns True, otherwise it is False.

If the mobile terminal is the called party, when the session incoming call is received, the local setting is read to confirm whether the authentication mode function has been enabled. Specifically, the markup about the authentication mode can be stored in the local file system and the timed auto-on function can be enabled. Whenever a number is called in, it is read whether this flag has been set to 1 (here 1 is true, that is, it is determined to be enabled), and its specific settings are defined as follows:

Bool CheckBeforeCallConnection() determines whether to access the call according to the return value of 1 and 0, that is, whether to enable the authentication mode, wherein if it is already enabled, a specific DTMF signal is sent to the primary caller to indicate that the call needs to be performed first. Comparative certification;

Bool SendDTMF (QualifyFirstDTMF), where QualifyFirstDTMF is a defined DTMF, which is used to determine whether the transmission is successful according to the return value flag.

And on the main caller:

You can call GetDTMF() to get the DTMF sent by the called party and parse it. If the parsing result needs to be compared first (that is, the comparison request information), the TEE that interacts with the security environment is called. API;

The GetKey() function is used to obtain the encrypted comparison key information. Then, the returned encrypted authentication key information is sent back to the called party through DTMF in a non-secure environment;

Bool SendDTMF (ChangetoDTMF (GetKey())), ChangetoDTMF can convert the acquired encrypted comparison key information into DTMF for transmission.

Correspondingly, the called party acquires the received DTMF signal by using GetDTMF(), and then transmits the encrypted comparison key information obtained from the DTMF signal to the security environment for parsing, and calls TEE. API: QualifyKey(GetDTMF()), return True if the comparison is successful, and return False if it is successful.

Among them, when the session is a phone call, if it is True, the phone is connected, and if it is False, the phone is hung up.

The above is only the embodiment of the present invention, and is not intended to limit the scope of the invention, and the equivalent structure or equivalent flow transformation made by the description of the present invention and the contents of the drawings, for example, the mutual technical features between the embodiments. Combinations, or direct or indirect use in other related technical fields, are included within the scope of the patent protection of the present invention.

Claims

A DTMF-based session authentication method, wherein the session authentication method includes:

The mobile terminal starts the authentication mode according to the user setting according to the daily time period, setting according to the spatial location setting or setting the weekly time, and setting the authentication mode according to the daily time period includes: turning off the authentication mode during the day and turning on the authentication at night. Mode, or enable the authentication mode from 22:00 to 7:00;

When receiving the session incoming call, the mobile terminal detects whether the authentication mode is enabled.

When it is detected that the authentication mode is enabled, the comparison request information stored locally is automatically acquired;

The mobile terminal sends the comparison request information to the primary calling party through DTMF dual tone multi-frequency, and receives the comparison key information that the primary calling party searches for and passes through the DTMF according to the comparison request information;

The mobile terminal performs the authentication verification on the comparison key information and the key stored in the locality;

When the authentication is passed, the mobile terminal accesses the session incoming call, and rejects or ignores the session incoming call when the compared authentication fails.
A DTMF-based session authentication method, wherein the session authentication method includes:

When receiving the session incoming call, the mobile terminal detects whether the authentication mode is enabled.

When it is detected that the authentication mode is enabled, the comparison request information stored locally is automatically acquired;

The mobile terminal sends the comparison request information to the primary calling party through DTMF dual tone multi-frequency, and receives the comparison key information that the primary calling party searches for and passes through the DTMF according to the comparison request information;

The mobile terminal performs the authentication verification on the comparison key information and the key stored in the locality;

When the authentication is passed, the mobile terminal accesses the session incoming call, and rejects or ignores the session incoming call when the compared authentication fails.
The session authentication method according to claim 2, wherein the step of detecting, by the mobile terminal, whether the authentication mode has been turned on when the mobile terminal receives the session incoming call comprises:

The mobile terminal starts the authentication mode according to the user setting according to the daily time period, setting according to the location of the space, or setting by the weekly time.
The session authentication method according to claim 3, wherein:

Turning on the authentication mode according to the daily time period includes turning off the authentication mode during the day and turning on the authentication mode at night, or turning on the authentication mode from 22:00 to 7:00.
The session authentication method according to claim 3, wherein:

Turning on the authentication mode according to the location of the space includes: turning off the authentication mode in the workplace and turning on the authentication mode when the residence is turned on, or turning on the authentication mode when driving the location.
The session authentication method according to claim 3, wherein:

Setting the authentication mode by weekly time includes turning off the authentication mode from Monday to Friday and enabling the authentication mode from Saturday to Sunday.
The session authentication method according to claim 2, wherein the session authentication method further comprises the step of: detecting, by the mobile terminal, whether the called party has the comparison request information transmitted by the DTMF when the session is called out.
The session authentication method according to claim 7, wherein the session authentication method further comprises the step of: when detecting the comparison request information, the mobile terminal searches for a local authentication according to the comparison request information. Key information.
The session authentication method according to claim 8, wherein the session authentication method further comprises the step of: the mobile terminal feeding back the comparison key information to the called party by DTMF, wherein the comparison is performed The key information is used for the called party to perform a comparative authentication with its local key to implement the session call out when the authentication is passed, or the session call fails when the authentication fails.
The session authentication method according to claim 9, wherein the step of the mobile terminal feeding back the comparison key information to the called party through DTMF comprises:

The mobile terminal encrypts the comparison key information and feeds back to the called party through DTMF after encryption.
A mobile terminal, wherein the mobile terminal comprises:

The detecting module is configured to detect whether the authentication mode is enabled when the session incoming call is received;

An obtaining module, configured to automatically obtain the comparison request information stored locally when detecting the enabled authentication mode;

a transceiver module, configured to send the comparison request information to the primary calling party by using DTMF dual tone multi-frequency, and receive the comparison key information that is searched by the primary calling party according to the comparison request information and fed back through DTMF ;

An authentication module, configured to perform the authentication verification on the comparison key information and the key stored in the locality;

The session module is configured to access the session incoming call when the authentication is passed, and reject or ignore the session incoming when the authentication fails.
The mobile terminal of claim 11, wherein the mobile terminal further comprises:

The setting module is configured to enable the authentication mode according to a user setting according to a daily time period, setting according to a spatial location, or setting by a weekly time.
The mobile terminal of claim 12, wherein the setting module is specifically configured to:

Turning on the authentication mode according to the daily time period includes turning off the authentication mode during the day and turning on the authentication mode at night, or turning on the authentication mode from 22:00 to 7:00.
The mobile terminal of claim 12, wherein the setting module is specifically configured to:

Turning on the authentication mode according to the location of the space includes: turning off the authentication mode in the workplace and turning on the authentication mode when the residence is turned on, or turning on the authentication mode when driving the location.
The mobile terminal of claim 12, wherein the setting module is specifically configured to:

Setting the authentication mode by weekly time includes turning off the authentication mode from Monday to Friday and enabling the authentication mode from Saturday to Sunday.
The mobile terminal of claim 11, wherein the transceiver module is further configured to detect and receive, when the session is called out, whether the called party has the comparison request information sent by the DTMF.
The mobile terminal of claim 11, wherein the mobile terminal further comprises a search module, wherein the search module is configured to locally search for a comparison according to the comparison request information when the comparison request information is detected. Key information.
The mobile terminal according to claim 16, wherein the transceiver module is further configured to feed back the comparison key information to the called party by using DTMF, wherein the comparison key information is used for The called party performs a comparative authentication with its local key to implement the session outgoing call when the authentication is passed, or the session call fails when the authentication fails.
The mobile terminal according to claim 18, wherein the transceiver module is configured to: encrypt the comparison key information, and feed back to the called party through DTMF after encryption.