Method for constructing certificateless public key cryptography

Abstract

The invention discloses a method for constructing a certificateless public key cryptography, which aims to solve the problem of private key hosting of an identification cryptography. Compared with other similar methods, the method is universal, and signature and encryption schemes with relatively higher security can be easily obtained by the construction method. The method comprises a system establishment method, a key generation method, a signature and verification method and an encryption and decryption method. In the system establishment method, an unlinkable randomizable signature is utilized. The key generation method comprises an initial identification private key obtaining step, a current identification private key generation step, a user public and private key setting step and thelike. The signature and verification method comprises a temporary identification private key generation step, a signature generation step, a signature verification step and the like. The encryption and decryption method comprises a public key acquisition and encryption step, a step of performing decryption by utilizing a corresponding private key, and the like.

Description

technical field [0001] The invention belongs to the field of information security, and in particular relates to public key encryption technology and identification or identity-based encryption technology. Background technique [0002] Public key cryptography is a widely used technology for encrypting files, messages and other information sent to designated recipients. The system using this cryptographic technology needs to generate a pair of mathematically related public key and private key for each user. The public key is publicly released in a certain way, so that any sender can obtain the receiver's public key and private key. It is then kept secret by the recipient. [0003] An important security requirement in the application of public key cryptography is to ensure that the public key used exactly belongs to the designated recipient, that is, a security mechanism that binds user identification (ID) and its public key is needed. [0004] In traditional public key crypt...

AI Technical Summary

Problems solved by technology

Correspondingly, the ciphertext generated by the identification cryptosystem can be decrypted in the key center, and there is a risk of information leakage

The second is the problem after the user ID private key is lost

In the traditional public key system, the user's identity and the public key are bound together. If the user's private key is lost, the user can regenerate a pair of public key and private key. In the identity cryptography system, the user's identity is the public key, so it cannot It is revoked

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