COMMUNICATION SYSTEM AND METHOD FOR PROTECTING MESSAGES BETWEEN TWO MOBILE PHONES

• US 20100054463A1
• Filed: 06/11/2009
• Published: 03/04/2010
• Est. Priority Date: 08/29/2008
• Status: Active Grant

• Current Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Original Assignee: Chi Mei Communication Systems Incorporated (Hon Hai Precision Industry Co., Ltd.)
• Inventors: TSAN, CHIH-LUNG
• Granted Patent: US 8,457,308 B2
• Time in Patent Office: Days
• US Class Current: 380/44
• CPC Class Codes: H04L 63/0428 wherein the data content is protected, e.g. by encrypting or encapsulating the payload

Abstract

A communication system and method for protecting messages between two mobile phones are provided. The method sets protective parameters in a first mobile phone, generates an encryption key and a decryption key according to the protective parameters, stores the decryption key into a storage device of the first mobile phone, and registers the encryption key to a second mobile phone through a wireless network. The method further encrypts a short message into an encrypted message in the second mobile phone according to the encryption key, and sends the encrypted message to the first mobile phone through the wireless network. In addition, the method decrypts the encrypted message to a readable message when the first mobile phone receives the encrypted message, and displays the readable message on a display screen of the first mobile phone.

Claims

1. A communication system for protecting messages between two mobile phones, the communication system comprising:

a first mobile phone and a second mobile phone, the first mobile phone comprising;

a storage device operable to store messages received by the first mobile phone; and

at least one processor operable to execute a message decryption unit, the message decryption unit comprising;

a setting module operable to set a plurality of protective parameters in the storage device;

a calculation module operable to generate an encryption key and a decryption key according to the plurality of protective parameters, and store the decryption key into the storage device;

a registry module operable to register the encryption key to the second mobile phone through a wireless network; and

a decryption module operable to decrypt an encrypted message to a readable message according to the decryption key when the first mobile phone receives the encrypted message from the second mobile phone, and display the readable message on a display screen of the first mobile phone.

2. The communication system according to claim 1, wherein the second mobile phone comprises an encryption module operable to encrypt a short message into the encrypted message according to the encryption key, and send the encrypted message to the first mobile phone through the wireless network.

3. The communication system according to claim 2, wherein the encryption module is further operable to generate an encryption tag, and pack the encryption tag into the encrypted message.

4. The communication system according to claim 3, wherein the decryption module is further operable to determine whether a short message is an encrypted message according to the encryption tag of the short message, and obtain the decryption key from the storage device according to a message security level of the encrypted message.

5. The communication system according to claim 1, wherein the message decryption unit further comprises a first deletion module operable to delete the decryption key from the first mobile phone when a deletion command is received.

6. The communication system according to claim 5, wherein the second mobile phone comprises a second deletion module operable to delete the encryption key from the second mobile phone when the deletion command is received from the first mobile phone.

7. A communication method for protecting messages between a first mobile phone and a second mobile phone, the communication method comprising:

(a) setting a plurality of protective parameters in the first mobile phone;

(b) generating an encryption key and a decryption key according to the protective parameters, and storing the decryption key into a storage device of the first mobile phone;

(c) registering the encryption key to the second mobile phone through a wireless network;

(d) encrypting a short message into an encrypted message in the second mobile phone according to the encryption key;

(e) sending the encrypted message to the first mobile phone through the wireless network;

(f) decrypting the encrypted message to a readable message when the first mobile phone receives the encrypted message; and

(g) displaying the readable message on a display screen of the first mobile phone.

8. The communication method according to claim 7, further comprising:

deleting the decryption key from the first mobile phone when a deletion command is received; and

deleting the encryption key from the second mobile phone when the second mobile phone receives the deletion command from the first mobile phone.

9. The communication method according to claim 7, wherein the block (c) comprises:

generating a registry request when the encryption key is generated;

sending the registry request to the second mobile phone through the wireless network;

determining whether the second mobile phone accepts the registry request;

rejecting the registry request from the first mobile phone if the second mobile phone does not accept the registry request; and

storing the encryption key into the second mobile phone if the second mobile phone accepts the registry request.

10. The communication method according to claim 7, wherein the block (d) comprises:

obtaining the encryption key from the second mobile phone;

encrypting the short message according to the encryption key to generate the encrypted message; and

generating an encryption tag, and packing the encryption tag into the encrypted message.

11. The communication method according to claim 10, wherein the block (f) comprises:

receiving a short message from the second mobile phone;

determining whether the short message is an encrypted message according to the encryption tag of the short message;

displaying the short message on the display screen of the first mobile phone if the short message is not the encrypted message;

receiving an input password from a user interface of the first mobile phone if the short message is an encrypted message;

determining whether the input password matches a predefined password;

obtaining the decryption key from the storage device according to a message security level of the encrypted message if the input password matches the predefined password; and

decrypting the encrypted message to the readable message according to the decryption key.

12. A readable medium having stored thereon instructions that, when executed by a first mobile phone and a second mobile phone, cause the two mobile phones to perform a method for protecting messages between the two mobile phones, the method comprising:

(a) setting a plurality of protective parameters in the first mobile phone;

(b) generating an encryption key and a decryption key according to the protective parameters, and storing the decryption key into a storage device of the first mobile phone;

(c) registering the encryption key to the second mobile phone through a wireless network;

(d) encrypting a short message into an encrypted message in the second mobile phone according to the encryption key;

(e) sending the encrypted message to the first mobile phone through the wireless network;

(f) decrypting the encrypted message to a readable message when the first mobile phone receives the encrypted message; and

(g) displaying the readable message on a display screen of the first mobile phone.

13. The medium according to claim 12, wherein the method further comprises:

deleting the decryption key from the first mobile phone when a deletion command is received; and

deleting the encryption key from the second mobile phone when the second mobile phone receives the deletion command from the first mobile phone.

14. The medium according to claim 12, wherein the block (c) comprises:

generating a registry request when the encryption key is generated;

sending the registry request to the second mobile phone through the wireless network;

determining whether the second mobile phone accepts the registry request;

rejecting the registry request from the first mobile phone if the second mobile phone does not accept the registry request; and

storing the encryption key into the second mobile phone if the second mobile phone accepts the registry request.

15. The medium according to claim 12, wherein the block (d) comprises:

obtaining the encryption key from the second mobile phone;

encrypting the short message according to the encryption key to generate the encrypted message; and

generating an encryption tag, and packing the encryption tag into the encrypted message.

16. The medium according to claim 15, wherein the block (f) comprises:

receiving a short message from the second mobile phone;

determining whether the short message is an encrypted message according to the encryption tag of the short message;

displaying the short message on the display screen of the first mobile phone if the short message is not the encrypted message;

receiving an input password from a user interface of the first mobile phone if the short message is an encrypted message;

determining whether the input password matches a predefined password;

obtaining the decryption key from the storage device according to a message security level of the encrypted message if the input password matches the predefined password; and

decrypting the encrypted message to the readable message according to the decryption key.