USER TERMINALS, AND METHODS AND COMPUTER-READABLE RECORDING MEDIUMS STORING COMPUTER PROGRAMS FOR TRANSMITTING AND RECEIVING MESSAGES

• US 20170118183A1
• Filed: 07/06/2016
• Published: 04/27/2017
• Est. Priority Date: 10/27/2015
• Status: Active Grant

• Current Assignee: LY Corp. (A Holdings Corp.), Z Intermediate Global Corporation
• Original Assignee: LINE Corporation (A Holdings Corp.)
• Inventors: SHIN, Ki Bin, WON, Jong II
• Granted Patent: US 10,230,697 B2
• Time in Patent Office: Days
• CPC Class Codes: H04L 63/0435 wherein the sending and receiving network entities apply symmetric encryption, i.e. same key used for encryption and decryption cryptographic mechanisms or cryptographic arrangements for symmetric key encryption H04L9/06
• CPC Class Codes: H04L 63/061 for key exchange, e.g. in peer-to-peer networks cryptographic mechanisms or cryptographic arrangements for key agreement H04L9/0838
• CPC Class Codes: H04L 63/08 for authentication of entities cryptographic mechanisms or cryptographic arrangements for entity authentication H04L9/32
• CPC Class Codes: H04L 63/123 received data contents, e.g. message integrity

Abstract

A non-transitory computer-readable recording medium storing computer-readable instructions that, when executed by a first user terminal, cause the first user terminal to perform a method including: receiving a first message including a first attached file, generating at least one encryption key for encrypting the first message by taking into account a type of the first attached file, encrypting the first attached file of the first message by using the encryption key, adding sender information of the first message to the first message, and transmitting the first message including the sender information to a message server, may be provided.

Claims

1. A non-transitory computer-readable recording medium storing computer-readable instructions that, when executed by a first user terminal, cause the first user terminal to perform a method comprising:

receiving a first message including a first attached file;

generating, based on a type of the first attached file, at least one encryption key for encrypting the first message;

encrypting the first attached file using the at least one encryption key;

adding sender information to the first message, the sender information associated with the first message; and

transmitting the first message including the sender information to a message server.

2. The non-transitory computer-readable recording medium of claim 1, wherein the generating at least one encryption key comprises:

generating a hash value of the first attached file as the at east one encryption key of the first attached file.

3. The non-transitory computer-readable recording medium of claim 1, wherein

the first attached file is a video file;

and

the generating at least one encryption key includes

generating a hash value of the first attached file as the encryption key of the first attached file.

4. The non-transitory computer-readable recording medium of claim 1, wherein the generating at least one encryption key comprises:

generating a plurality of encryption keys for a plurality of second user terminals for transmitting the first message to the plurality of second user terminals.

5. The non-transitory computer-readable recording medium of claim 1, wherein the method further comprises:

receiving a second message and an index associated with a second attached file, the second message transmitted by a second user terminal via the message server;

extracting the index;

calling the second attached file from the message server using the index; and

decrypting the second attached file using a decryption key received from the second user terminal.

6. The non-transitory computer-readable recording medium of claim 1, wherein the method further comprises:

inputting an authentication key, the authentication key transmitted from a second user terminal, to read the first message through the second user terminal.

7. The non-transitory computer-readable recording medium of claim 6, wherein the inputting an authentication key comprises:

transmitting the authentication key from the second user terminal to the message server;

receiving a validation result with regard to the authentication key in response to the transmitted authentication key; and

transmitting the first message and the second message to the second user terminal according to the validation result.

8. The non-transitory computer-readable recording medium of claim 6, wherein the inputting the authentication key comprises:

encrypting the first and second messages using the authentication key; and

transmitting the encrypted first and second messages to the second user terminal.

9. A user terminal comprising:

a memory storing computer-readable instructions; and

at least one processor configured to execute the computer-readable instructions such that the at least one processor is configured to

receive a first message including a first attached file, the first message including sender information,

generate, based on a type of the first attached file, an encryption key for encrypting the first message, and

encrypt the first attached file of the first message using the encryption key; and

a transceiver configured to transmit the first message to a message server.

10. The user terminal of claim 9, wherein, when a size of the first attached file is greater than or equal to a threshold value, the at least one processor is configured to execute the computer-readable instructions such that the at least one processor is further configured to generate a hash value of the first attached file as the encryption key of the first attached file.

11. The user terminal of claim 9, wherein

the first attached file is a video file;

and

the at least one processor is configured to execute the computer-readable instructions such that the at least one processor is further configured to generate a hash value of the first attached file as the encryption key of the first attached file.

12. The user terminal of claim 9, wherein the at least one processor is configured to execute the computer-readable instructions such that the at least one processor is further configured to generate a plurality of encryption keys for a plurality of other user terminals for transmitting the first message to the plurality of other user terminals.

13. The user terminal of claim 9, wherein the at least one processor is configured to execute the computer-readable instructions such that the at least one processor is further configured to

receive a second message and an index associated with a second attached file, the second message received from a second user terminal via the message server;

extract an index;

call the second attached file from the message server using the index; and

decrypt the second attached file using a decryption key received from the second user terminal.

14. The user terminal of claim 9, wherein the at least one processor is configured to execute the computer-readable instructions such that the at least one processor is further configured to

receive an authentication key from a second user terminal to read the first message through the second user terminal.

15. The user terminal of claim 14, wherein the transceiver is further configured to

transmit the authentication key to the message server;

receive a validation result with regard to the authentication key in response to the transmitted authentication key; and

selectively transmit the first message and the second message to the second user terminal based on the validation result.

16. The user terminal of claim 14, wherein

the at least one processor is further configured to execute the computer-readable instructions such that the at least one processor is further configured to encrypt the first and second messages using the authentication key;

and

the transceiver is further configured to transmit the encrypted first and second messages to the second user terminal.