Method for combining identity-based cryptography and conventional public key cryptography

Abstract

The invention discloses a method for combining an identity-based cryptography and a conventional public key cryptography. Potential hazards in the private key hosting of the identity-based cryptography can be solved. Compared with other similar methods such as certificate-based encryption (CBE), a certificateless public key cryptography (CL-PKC) or a self-certified public key cryptography (SC-PKC), the method has the advantage of avoiding the limitations of the public key cryptography. The method provided by the invention comprises a signature method and an encryption method. The signature method comprises the following three steps of: 1, generating an identity signature; 2, generating a message signature; and 3, verifying the message signature. The encryption method comprises the following three steps of: 1, generating the identity signature; 2, encrypting a message; and 3, decrypting and recovering the message.

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 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 the user identification (ID) and its public key is required. [0004] In traditional public key cryptosyste...

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

[0013] Assuming that the key center is trustworthy, that is, although the key center can calculate the user's identity private key, it will not replace the user's public key. CBE, SC-PKC, and CL-PKC can all solve the identity password The private key escrow problem of the system, but the public key cryptosystem adopted by them is limited by the original identification cryptosystem

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