An Obfuscation Method for Encrypted Group Signature

Abstract

The invention relates to an obfuscation method for encrypting group signatures, which is used to protect the signature private keys of members in the group. Secret key TK; 2) Information receivers obtain their own encrypted public key PKe and decrypted private key SKe through the EKGen algorithm according to the group parameter sequence pub; 3) The group owner obtains the signature tracking information sID of the members in the group and their respective IDs through the Enroll algorithm Corresponding signature key KID, and send the signature key KID to the corresponding group members; 4) Obfuscate the initial encrypted group signature algorithm EGS of the group members and the signature key KID of the group members according to the obfuscation algorithm Obf , to obtain the encrypted group signature algorithm after obfuscation; 5) Encrypt the message M to be sent with information signature encryption to generate encrypted ciphertext C, and send encrypted ciphertext C to the information receiver. Compared with the prior art, the present invention has the advantages of being suitable for protecting private keys, having good secrecy effect and the like.

Description

technical field [0001] The invention relates to the fields of cryptography, group signatures and confusion theory, in particular to a method for confusing encryption group signatures. Background technique [0002] Group signature is a special digital signature designed for a group of members, originally proposed by Cham and Heyst. In a group signature, there is a group manager and many members. Each group has a group public key for authentication. Each group member has an independent private key to generate a group signature, and its signature can be detected by the group public key. Group managers have a master key. Assuming a signature, the group administrator can use the master key to know which group member generated the signature. This is traceability. In addition, other group members without the master key cannot know which group member generated the signature, which is called anonymity. In fact, group signatures have the following four properties: 1) only group ...

AI Technical Summary

Problems solved by technology

A typical white-box attack environment is, for example: a computer that has been compromised and obtained administrator privileges, a mobile agent running on a malicious host, a stolen tablet or smart phone, etc. (at this time, for professional hackers , breaking access passwords or graphic passwords is not difficult), in addition, the SSL Heartbleed vulnerability exposed in 2014 can allow attackers to remotely obtain certain memory segments on the server, and if the signature key is stored in it, the consequences are equally serious

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