WO2020015090A1

WO2020015090A1 - Method and device for generating mail recording position information of sender, and storage medium

Info

Publication number: WO2020015090A1
Application number: PCT/CN2018/104852
Authority: WO
Inventors: 王高华; 余鹏; 袁剑波; 王荣端; 高钜枝; 余凌峰
Original assignee: 密信技术(深圳)有限公司
Priority date: 2018-07-20
Filing date: 2018-09-10
Publication date: 2020-01-23
Also published as: CN109005105A; CN109005105B

Abstract

The present application discloses a method for generating a mail recording position information about a sender, said method comprising the following steps: acquiring the current positioning information about a device as position information; adding the position information to the signed attribute of a mail signature, and calculating the characteristic value of the signed attribute; signing the characteristic value by means of a signature certificate of the device, so as to generate signature data; and according to the characteristic value and the signature data, generating a signature mail. The present application further discloses a device for generating a mail recording position information about a sender, and a computer readable storage medium.

Description

Method, device and storage medium for generating sender position information email Ranch

Technical field

The present application relates to the field of electronic mail technology, and in particular, to a method, a device, and a computer-readable storage medium for generating a sender's location information email.

Background technique

With the development of communication technology, e-mail is also constantly developing, from the earliest plain text mail to the present encrypted mail and signed mail. Users increasingly value the confidentiality and authenticity of email. But simply encrypting and signing emails is no longer sufficient. In the prior art, because the email does not carry the geographic location information of the sender, the mail receiver needs to know the real location information when the mail sender sends the mail, or when the mail sender needs to prove to the mail receiver that he sent the mail Location, existing email technology cannot meet user needs.

The above content is only used to assist in understanding the technical solution of the present application, and does not mean that the above content is prior art.

Summary of the invention

The main purpose of this application is to provide a method, device, and computer-readable storage medium for generating a sender's location information email, which aims to prove the true location information of the email sender when sending the email.

To achieve the above objective, the present application provides a method for generating a sender's location information email. The method for generating a sender's location information email includes the following steps:

Obtaining the current positioning information of the device as the position information;

Adding the location information to a signed attribute of a mail signature, and calculating a characteristic value of the signed attribute;

Signing the characteristic value with a signature certificate of the device to generate signature data; and

Generate a signed mail according to the feature value and the signature data.

In addition, in order to achieve the above-mentioned object, the present application further provides a device for generating a sender's location information email, where the device includes: a memory, a processor, and stored on the memory and can run on the processor A mail generating program that, when executed by the processor, implements the steps of the method for generating a mail that records sender location information as described above.

In addition, in order to achieve the above object, the present application also provides a computer-readable storage medium, wherein the computer-readable storage medium stores a mail generating program, and the mail generating program is implemented by the processor to implement the above-mentioned Record the steps of the method for generating the sender's location information email.

An embodiment of the present application provides a method, an apparatus, and a computer-readable storage medium for generating a record of a sender's location information. By acquiring current location information of a device as the location information, and adding the location information to a signed attribute of a mail signature Then, the feature value of the signed attribute is calculated, and then the feature value is signed by the device's signing certificate, signature data is generated, and a signed email is finally generated according to the feature value and the signature data. In this way, the purpose of inserting the location information into the signed attributes of the signed mail is achieved, thereby solving the technical problem that the prior art cannot insert the location information into the email.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 is a schematic structural diagram of a terminal of a hardware operating environment involved in the solution according to an embodiment of the present application;

FIG. 2 is a schematic flowchart of a first embodiment of a method for generating a location information email of a sender of this application;

3 is a schematic flowchart of a second embodiment of a method for generating a sender's location information email in this application;

4 is a schematic flowchart of a third embodiment of a method for generating a sender's location information email in this application;

FIG. 5 is a schematic flowchart of a fourth embodiment of a method for generating a location information email of a sender of this application;

FIG. 6 is a schematic flowchart of a fifth embodiment of a method for generating a location information email of a sender of this application;

7 is a schematic flowchart of a sixth embodiment of a method for generating a sender's location information email in this application;

8 is a schematic flowchart of a seventh embodiment of a method for generating a sender's location information email in this application;

FIG. 9 is a schematic flowchart of an eighth embodiment of a method for generating a sender's location information email in this application.

The implementation, functional features and advantages of the purpose of this application will be further described with reference to the embodiments and the drawings.

detailed description

It should be understood that the specific embodiments described herein are only used to explain the application, and are not used to limit the application.

The main solutions of the embodiments of the present application are:

Signing the characteristic value by using a signature certificate of the device to generate signature data;

Generate a signed email based on the feature value and the signature data

Due to the existing technology, it is impossible to insert the location information of the sender in the email.

An embodiment of the present application provides a method for generating a sender's location information email, which obtains current location information of a sending device of the email and inserts the location information into a signed attribute of a signed email, thereby solving the problem that the prior art cannot Technical issues with inserting location information into emails. Ranch

As shown in FIG. 1, FIG. 1 is a schematic structural diagram of a terminal of a hardware operating environment involved in the solution of the embodiment of the present application.

In the embodiment of the present application, the terminal may be a PC and / or an intelligent mobile terminal.

As shown in FIG. 1, the terminal may include a processor 1001, such as a CPU, a communication bus 1002, a display 1003, a network interface 1004, and a memory 1005. The communication bus 1002 is used to implement connection and communication between these components. The memory 1005 may be a high-speed RAM memory or a non-volatile memory. memory), such as disk storage. The memory 1005 may optionally be a storage device independent of the foregoing processor 1001.

Those skilled in the art can understand that the terminal structure shown in FIG. 1 does not constitute a limitation on the terminal, and may include more or fewer components than shown in the figure, or some components may be combined, or different components may be arranged.

As shown in FIG. 1, the memory 1005 as a computer-readable storage medium may include an operating system, a network communication module, a user interface module, and a mail generating program.

In the terminal shown in FIG. 1, the network interface 1004 is mainly used to connect to the background server and perform data communication with the background server; the user interface 1003 is mainly used to connect to the client (user) and perform data communication with the client, thereby achieving The purpose of the client to output data; and the processor 1001 can be used to call the mail generating program stored in the memory 1005 and perform the following operations:

Generate a signed email based on the feature value and the signature data

Referring to FIG. 2, a first embodiment of a method for generating a sender's location information email according to the present application. The method for generating a sender's location information email includes: Ranch

Step S10: Acquire the current positioning information of the device as the position information.

In this embodiment, the device positioning information is first obtained as the position information, where the positioning information is directly obtained through the bottom layer, and the mail sending end cannot customize the change.

Specifically, when the current system is the Android system, since the Android platform supports the API (Application Programming) that provides location services Interface (Application Programming Interface), so during the development process, two objects, LocationManager (Location Manager) and LocationProviders (Location Providers), can be used to obtain the current location information of the device.

For example: first add the permission to access location information android.permision.ACCESS_FINE_LOCATION, where the permission can be customized by the user. When the user chooses to turn off the permission, output the prompt message that the email cannot be generated because the location information cannot be obtained. When the permission is enabled, the application can directly obtain the current location information (current latitude and longitude information) of the device through the LocationManager (Location Manager) class. Then, the positioning information is converted into position information (that is, the latitude and longitude information is converted into corresponding general location information such as a country, region, and street).

When the current system is the iOS system, due to the built-in positioning function of the iOS system, after importing the CoreLocation (co-location) library during development, it can be obtained using CLLocationManager (the location manager of the iOS system, that is, the second location manager) Location information.

For example, first obtain a positioning right, where a user can control whether to use the positioning right through a client. When the user is not allowed to use the positioning permission, the prompt information that the email cannot be generated because the location information cannot be obtained is output, otherwise the current location information of the device is obtained through the CLLocationManager class, and then the location information is converted into location information.

When the current system is a Windows system, first obtain the data access right of the third-party positioning application (for example, Gaode map) or the current IP address of the device, and obtain the third-party application data access right or the device's current When the IP address is used, read the positioning information of the third-party application (for example, read "My Location" stored on the Gaode map), or calculate the current positioning information of the device from the IP address, and then use the positioning Information as location information.

It should be noted that, to ensure the reliability of the location information, the step of obtaining the location information is performed at the bottom layer, and the obtained location information cannot be changed.

Step S20: Add the location information to a signed attribute of a mail signature, and calculate a characteristic value of the signed attribute;

In this embodiment, when the location information is obtained, the location information is used as a data item in a signed attribute of a signed mail, inserted into the signed attribute, and then the signed attribute of the inserted location information is calculated. Eigenvalues.

Specifically, first create a main structure of the signed mail, where the main structure includes the data type and data content of the signed mail, and then create a SignData (signature data) of the data content, where the SignData includes the version number of the signed data, the signature Algorithm, signed content, certificate chain of signing certificate, CRL (Certificate of signing certificate) Revocation List , Certificate revocation list) and SignerInfos. The SignerInfos may include a signer digital certificate identification, a hash algorithm of the original message, a signed attribute (SignedAttrs), a signature algorithm, a result after signing the private key, and an unsigned attribute (UnSignedAttrs). Further, when the signed attribute is generated, when the signed attribute is generated, a hash value of the original text is first calculated, and then the location information of the device is obtained, and the hash value of the original text and the location information are encapsulated. Into the signed properties. In addition, the signed attributes may also include a signature time, a signature algorithm supported by a signer, a symmetric encryption algorithm, and a set of key encryption algorithms.

In addition, when inserting the location information into the signed attribute, first determine a corresponding item of the location information in the signed attribute, and add an object identifier (OID, Object) of the corresponding item. Identifier, for example, the OID may be 1.3.6.1.4.1.50775.2.8).

After the signed attribute is generated, a characteristic value of the signed attribute, that is, a hash value of the signed attribute is calculated to apply a signer's signature private key.

Step S30: Sign the characteristic value by using a signature certificate of the device to generate signature data;

Step S40: Generate a signature mail according to the feature value and the signature data.

In this embodiment, after obtaining the signature value of the signed attribute through calculation, signing the signature value with a device's signature certificate, generating signature data, and then generating a signature based on the signature value and the signature data mail.

In this embodiment, first obtain the current location information, then insert the location information into the signed attributes of the signed email to generate signature data, and finally generate a signed email based on the signed data. Mail, which solves the technical problem that the existing technology cannot add geographic locations to mail.

Further, referring to FIG. 3, a second embodiment of a method for generating a sender's location information email according to the present application. Based on the above first embodiment, the step S10 includes:

Step S11: When the current system is the Android system and the positioning permission of the Android system is obtained, obtain the current latitude and longitude information of the device through a first location manager class;

Step S12: Determine the location information according to the current latitude and longitude information.

In this embodiment, when the current system is an Android system, the API (Application Programming Interface (Application Programming Interface), so during the development process, two objects, LocationManager (Location Manager) and LocationProviders (Location Providers), can be used to obtain the current location information of the device.

For example: Get positioning permission first android.permision.ACCESS_FINE_LOCATION, where the permission can be customized by the user. When the user chooses to turn off the permission, it outputs a prompt message that the email cannot be generated because the location information cannot be obtained. When the permission is enabled, the application can directly obtain the current location information (current latitude and longitude information) of the device through the LocationManager (Location Manager) class. Then, the positioning information is converted into position information (that is, the latitude and longitude information is converted into corresponding general location information such as a country, region, and street).

It should be noted that the method described in this application is applicable to at least Android, iOS and Windows systems.

In this embodiment, the positioning authority of the system is obtained first, and then the current positioning information of the device is obtained, and then the location information is determined, so that the reliability of the obtained location information is improved.

Further, referring to FIG. 4, a third embodiment of a method for generating a sender's location information email according to the present application. Based on the first embodiment, step S10 further includes:

Step S13: When the current system is the iOS system and the positioning permission of the iOS system is obtained, obtain the current latitude and longitude information of the device through a second location manager class;

Step S14: Determine the position information according to the current latitude and longitude information.

It should be noted that during the development process, different location acquisition methods are adopted for different systems (for example: Android system, iOS system, or Windows system). Understandably, when the current system is an iOS system, the location acquisition program installed on the device must be a location acquisition program corresponding to the iOS system.

When developing a program for the iOS system, which solves the problem of obtaining positioning information under the iOS system, it can be obtained by importing the CoreLocation (co-location) library and using CLLocationManager (the location manager of the iOS system, that is, the second location manager). Location information.

In this embodiment, the positioning permission under iOS is obtained first, then the positioning information is obtained according to the positioning permission, and the location information is determined according to the positioning information. This achieves the purpose of obtaining reliable location information under the iOS system, and improves the Compatibility and reliability of location information.

Further, referring to FIG. 5, a fourth embodiment of a method for generating a sender's location information email according to the present application. Based on the first embodiment, step S10 further includes:

Step S15: Obtain a third-party application data access right or the current IP address of the device;

In this embodiment, when the current system is a Windows system, the access right of the third-party application data of the Windows system (for example, the right to access Gaode map data) is obtained, or the current IP address of the device is obtained.

It should be noted that the third-party data access right of the device and the current IP address can be obtained at the same time.

Step S16: When the third-party application data access right or the current IP address of the device is obtained, read the current location information saved by the third-party application or calculate the location information corresponding to the IP address;

Step S17: Use the current location information or location information corresponding to the IP address as the location information.

In this embodiment, when the access right of the third data is obtained, the data of the third-party application is read, and the current positioning information is determined according to the data of the third-party application. For example, reading data of a high German map that is currently installed in the system, where the data of the high German map may include "my location", that is, current location information. Then, the current device positioning information is determined according to the determined positioning information of the third-party application.

When the current IP address of the device is obtained, according to the IP The current location information of the address calculation device. According to the current location information of the IP address calculation device, a database of address information corresponding to the IP address may be generated in advance, and then the positioning information is queried in the database according to the IP address, or may be through a network , Querying the positioning information corresponding to the IP address in a third-party database.

Furthermore, the positioning information corresponding to the IP address and the positioning information determined according to a third-party application are used as the location information.

It should be noted that when a positioning module exists in the Windows system, the positioning information may also be obtained directly through the positioning module.

In this embodiment, the access right or IP address of the third-party application data is obtained first, and then the location information is determined according to the data or IP address of the third-party application, so that when the device does not have a positioning module, the current positioning of the device is obtained. The purpose of the information.

Further, referring to FIG. 6, a fifth embodiment of a method for generating a sender's location information email according to the present application. Based on the first to fourth embodiments, step S20 further includes:

Step S21: Determine a corresponding item of the location information in the signed attribute;

Step S22: Add the object identifier of the corresponding item for a third-party application at the receiving end of the signed email to obtain the location information through the object identifier.

In this embodiment, the signed attributes may include a signing time, a signer's encryption certificate, a hash of the original message, data type, location information, a signature algorithm supported by the signer, a symmetric encryption algorithm, and a set of key encryption algorithms. . Therefore, when inserting the location information, an AIA (Program Source File Format) ASN.1 (information system network (information system network) structure generates an extension containing location information, and its OID can be 1.3.6.1.4.1.50775.2.8.

In this embodiment, first determine a corresponding item of the location information in the signed attribute, and then add the corresponding object identifier, so that any third-party application can obtain the location through the object identifier. The purpose of the information is to improve the compatibility of the location information.

Further, referring to FIG. 7, a sixth embodiment of a method for generating a sender's location information email according to the present application. Based on the first to fifth embodiments, the method for generating a sender's location information email further includes:

Step S50: When receiving the signed mail, verify whether the signature of the signed mail is valid;

Step S60: When the signature of the signed email is valid, parse out the location information carried in the signed email.

In this embodiment, when a mail is received, it is first determined whether the mail is a signed mail. When the mail is a signed mail, obtain signature data of the signed mail, and verify whether the signature of the signed mail is valid according to the signature data of the signed mail.

When the signature is valid, the location information is determined to be tampered, and then the signature data carried in the signed email is parsed.

In this embodiment, first verify whether the signature of the signed mail is valid, determine that the location information has not been tampered with when the signature is valid, and then parse out the location information, so that the reliability of the location information received by the receiver is improved.

Further, referring to FIG. 8, a seventh embodiment of a method for generating a sender's location information email according to the present application. Based on the first to sixth embodiments, step S50 includes:

Step S51: When the signed signature certificate exists, determine whether the signature time of the signature is within the permitted time of the signed certificate;

In this embodiment, first determine whether the signature certificate of the signature exists. When the signature certificate exists, determine whether the signature time of the signature is within the permission time of the signature certificate. Otherwise, determine that the signature is invalid. .

Specifically, a certificate chain of a signature certificate carried in the signed email is obtained, and then whether the signature certificate exists is determined according to the certificate chain of the signature certificate. When the signature certificate exists, obtain the validity time (ie, the permission time) of the signature certificate and the signature time in the signed attribute, and determine whether the signature time is within the validity time. Otherwise, it is determined that the signature is invalid.

Step S52: When the signature time is within the permission time, calculate a hash value of the original text of the signed email;

In this embodiment, when the signature time is within the permission time, the original text content and a hash algorithm of the original text are obtained, and a hash of the original text is calculated according to the hash algorithm of the original text. value. And comparing the calculated hash value of the original text with the Message carried in the signed email Digest (message digest) is the same.

When the signature time is not within the permission time, it is determined that the signature is invalid.

It should be noted that the Message Digest (Message Digest) is a common sense component of signed emails and will not be described again.

Step S53: When the original hash value is the same as the message digest, decrypt the signature according to the signature certificate;

In this embodiment, when the hash value of the original text is the same as the message digest, the public key of the signing certificate is obtained to decrypt the signature of the signed mail, and the decryption result is signed with signedAttributes (signed Attribute).

When the hash value of the original text is different from the message digest, it is determined that the signature is invalid.

Step S54: When the decryption result is the same as the hash value of the signed attribute, determine that the signature is valid.

In this embodiment, when the decryption result is the same as the hash value in signedAttributes, the signature is determined to be valid. Otherwise, it is determined that the signature is invalid.

In this embodiment, first determine whether a signature certificate exists, determine whether the signature time is valid when the signature certificate exists, and determine whether the original hash value is the same as the message digest when the signature time is valid. When the same, determine the decryption Whether the result is the same as the hash value, and then the signature is determined to be valid when the hash value is the same. In this way, through multiple determinations, the reliability of the signature verification is improved and the authenticity of the signed mail information is improved.

Further, referring to FIG. 9, an eighth embodiment of a method for generating a sender's location information email according to the present application. Based on the first to seventh embodiments, after step S60, the method further includes:

Step S70: According to the object identifier, read the location information carried in the signed email through the third-party application, and display the location information on a map.

In this embodiment, upon receiving the signed email, a third-party application (which may be a map application, such as Gaode Map, Baidu Map, etc.) obtains the object identifier of the location information carried by the signed attribute in the signed email Character (for example, ID: 1.3.6.1.4.1.50775.2.8), and then obtain the location information from the signed attributes according to the object identifier. The position information is displayed on a map.

It should be noted that when the type of the obtained position information is latitude and longitude information, the position information is converted into a country, region, or street in a map and displayed.

In this embodiment, when receiving a signed email carrying location information, a third-party application can obtain the location information according to the object identifier and display it on the map, so that the location information can be displayed more intuitively.

In addition, an embodiment of the present application further provides a device for generating a sender's position information email, where the device includes: a memory, a processor, and a mail generator stored on the memory and capable of running on the processor. A program that, when executed by the processor, implements the steps of the method for generating a mail that records sender location information as described above.

In addition, an embodiment of the present application further provides a computer-readable storage medium, wherein the computer-readable storage medium stores a mail generating program, and when the mail generating program is executed by a processor, the mail generating program is implemented as described in the foregoing embodiment. Record the steps of the method for generating the sender's location information email.

It should be noted that, in this article, the terms "including", "including" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, It also includes other elements not explicitly listed, or elements inherent to such a process, method, article, or system. Without more restrictions, an element limited by the sentence "including a ..." does not exclude the existence of other identical elements in the process, method, article, or system that includes the element.

The above-mentioned serial numbers of the embodiments of the present application are merely for description, and do not represent the superiority or inferiority of the embodiments.

Through the description of the above embodiments, those skilled in the art can clearly understand that the methods in the above embodiments can be implemented by means of software plus a necessary universal hardware platform, and of course, also by hardware, but in many cases the former is better. Implementation. Based on such an understanding, the technical solution of this application that is essentially or contributes to the existing technology may be embodied in the form of a software product, which is stored in a computer-readable storage medium (such as The ROM / RAM, magnetic disk, and optical disc) include several instructions for causing a terminal device (such as a mobile phone, a computer, or a tablet computer) to execute the methods described in the embodiments of the present application.

The above are only preferred embodiments of the present application, and thus do not limit the patent scope of the present application. Any equivalent structure or equivalent process transformation made by using the contents of the specification and drawings of the present application, or directly or indirectly used in other related technical fields Are included in the scope of patent protection of this application.

Claims

A method for generating a sender's location information email, wherein the method for generating a sender's location information email includes the following steps:

Obtaining the current positioning information of the device as the position information;

Adding the location information to a signed attribute of a mail signature, and calculating a characteristic value of the signed attribute;

Signing the characteristic value with a signature certificate of the device to generate signature data; and

Generate a signed mail according to the feature value and the signature data.
The method of claim 1, wherein the step of obtaining the current location information of the device as the location information comprises:

When the current system is the Android system and the positioning permission of the Android system is obtained, the current latitude and longitude information of the device is obtained through the first location manager class; and

Determining the position information according to the current latitude and longitude information.
The method for generating a sender's location information email according to claim 2, wherein when the current system is an Android system and the positioning permission of the Android system is obtained, the device is obtained through a first location manager class Before the steps of current latitude and longitude information, it also includes:

Output the permission acquisition request information of the positioning permission of the Android system; and

When receiving the authorization instruction, acquiring the positioning permission of the Android system.
The method of claim 1, wherein the step of obtaining the current location information of the device as the location information comprises:

When the current system is the iOS system and the positioning permission of the iOS system is obtained, the current latitude and longitude information of the device is obtained through a second location manager class; and

Determining the position information according to the current latitude and longitude information.
The method for generating a sender's location information email according to claim 4, wherein when the current system is an iOS system and the positioning permission of the iOS system is obtained, the device is obtained through a second location manager class Before the steps of current latitude and longitude information, it also includes:

Output the permission acquisition request information of the iOS system positioning permission; and

When receiving the authorization instruction, obtaining the positioning permission of the iOS system.
The method of claim 1, wherein the step of obtaining the current location information of the device as the location information comprises:

Obtaining third-party application data access rights or the current IP address of the device;

When obtaining the third-party application data access right or the current IP address of the device, reading the current location information saved by the third-party application or calculating the location information corresponding to the IP address; and

Using the current location information or location information corresponding to the IP address as the location information.
The method according to claim 6, wherein the step of calculating the location information corresponding to the IP address comprises:

Generating a database of address information corresponding to the IP address in advance; and

Querying positioning information in the database according to the IP address.
The method according to claim 6, wherein the step of calculating the location information corresponding to the IP address comprises:

Through a network, query the positioning information corresponding to the IP address in a third-party database.
The method of claim 1, wherein the step of adding the location information to a signed attribute of a mail signature comprises:

Determining a corresponding item of the location information in the signed attribute; and

The object identifier of the corresponding item is added, so that a third-party application at the receiving end of the signed email obtains the location information through the object identifier.
The method for generating a record sender location information email according to claim 9, wherein the method of generating a record sender location information email further comprises:

Verifying whether the signature of the signed mail is valid when the signed mail is received; and

When the signature of the signed email is valid, the location information carried in the signed email is parsed.
The method according to claim 10, wherein the step of verifying whether a signature of the signed mail is valid comprises:

When the signed signing certificate exists, determining whether the signing time of the signature is within a permitted time of the signing certificate;

When the signature time is within the permission time, calculating a hash value of the original text of the signed email;

When the original hash value is the same as the message digest, decrypting the signature according to the signing certificate; and

When the decryption result is the same as the hash value of the signed attribute, it is determined that the signature is valid.
The method for generating a sender's location information email according to claim 11, wherein the step of determining whether a signature time of the signature is within a permitted time of the signature certificate comprises:

Obtaining the validity time of the signing certificate and the signing time in the signed attributes; and

Determine whether the signature time is within the valid time.
The method of claim 10, wherein after the step of parsing the location information carried in the signed email, the method further comprises:

Reading the location information carried in the signed email through the third-party application according to the object identifier, and displaying the location information on a map.
The method of claim 13, wherein the object identifier is stored in a signed attribute of the signed mail.
The method of claim 1, wherein the compatible system is an Android system, an iOS system, or a Windows system.
A device for generating a sender's location information email, wherein the device for generating a sender's location information email includes: a memory, a processor, and a mail generator stored on the memory and operable on the processor Program, the mail generating program implements the following steps when executed by the processor:

Obtaining the current positioning information of the device as the position information;

Adding the location information to a signed attribute of a mail signature, and calculating a characteristic value of the signed attribute;

Signing the characteristic value with a signature certificate of the device to generate signature data; and

Generate a signed mail according to the feature value and the signature data.
A computer-readable storage medium, wherein the computer-readable storage medium stores a mail generating program, and the mail generating program implements the following steps when executed by a processor:

Obtaining the current positioning information of the device as the position information;

Adding the location information to a signed attribute of a mail signature, and calculating a characteristic value of the signed attribute;

Signing the characteristic value with a signature certificate of the device to generate signature data; and

Generate a signed mail according to the feature value and the signature data.