Short ciphertext identity-based encryption method satisfying forward security

Abstract

The invention discloses a short ciphertext identity-based encryption method satisfying forward security. The short ciphertext identity-based encryption method includes six steps of 1) initializing a private key generating mechanism; 2) registering and authenticating users; 3) generating and issuing initial private keys; 4) updating the private keys; 5) encrypting; 6) decrypting. On the basis of the identity-based encryption mechanism, forward security is realized, the users can independently update private keys, loss caused by revealing of the private keys can be effectively reduced, and the short ciphertext identity-based encryption method is applicable to the communication encryption solution scheme in the open network environment and non-secure devices. In addition, ciphertext is short and fixed in length, encryption and decryption cost low, authentication link is omitted for decryption, and encryption and decryption are high in efficiency, so that the short ciphertext identity-based encryption method has wider application range in actual application.

Description

(1) Technical field [0001] The invention relates to a short ciphertext identity-based encryption method satisfying forward security, which can effectively reduce the security threat caused by the leakage of a private key, and belongs to the field of public key encryption system. (2) Background technology [0002] Today, with the rapid development of digitalization, information security has gradually become an important issue, and data encryption is an important means to ensure information security. Modern data encryption systems include two basic encryption systems: symmetric encryption and asymmetric encryption. Among them, asymmetric encryption is also called public key encryption. Encryptors and decryptors use asymmetric keys to encrypt and decrypt data during the communication process, without prior key negotiation, which reduces the security requirements for communication channels. Therefore, public key encryption has been widely used. [0003] In the traditional publ...

AI Technical Summary

Problems solved by technology

This method can be used to solve the security problem caused by the leakage of the private key in the identity-based encryption system. Even if the attacker obtains the private key of a legitimate user at the current moment, the attacker cannot obtain the private key of the user at the previous moment. Still unable to decipher the ciphertext message sent to the user at the previous moment

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