Encryption and decryption method and electronic device

Abstract

Embodiments of the invention provide an encryption method, a decryption method and electronic equipment. The method comprises steps of acquiring a public key, a plaintext and a first bit string of a preset length through first electronic equipment, wherein the public key comprises the only defect trapdoor function; acquiring a key pair of a one-time signature scheme by the first electronic equipment, wherein the public pair comprises a verification secret key and a signature secret key corresponding to the verification secret key; acquiring a middle cryptograph set according to the only defect trapdoor function, the first bit string of the preset length, the plaintext and the verification secret key; signing the middle cryptograph set by the first electronic equipment according to the signature secret key, and acquiring a signature of the middle cryptograph set; and forming a final cryptograph by combing the verification secret key, the middle cryptograph set and the signature of the middle cryptograph set, and outputting the final cryptograph. Therefore, anti-selection cryptograph attack is achieved.

Description

technical field [0001] The embodiments of the present invention relate to information security technology, and in particular, to an encryption and decryption method and electronic equipment. Background technique [0002] Chosen ciphertext attack refers to an attack model. In this attack model, the content that the attacker needs to master includes: the encryption algorithm, the intercepted part of the ciphertext, the ciphertext message of his choice, and the corresponding decrypted plaintext. Chosen ciphertext attack requires the attacker to have access to the decryption language machine, so as to obtain the decryption result of the ciphertext constructed by the attacker himself. The attacker can arbitrarily collect a certain amount of ciphertext in advance. The ciphertext is encrypted by the target encryption algorithm. From this, the encryptor's private key or decomposition modulus can be calculated. Using this information, the attacker can recover all the plaintext. [...

AI Technical Summary

Problems solved by technology

Existing encryption schemes are insecure against chosen ciphertext attacks, therefore, it is urgent to propose an encryption scheme resistant to chosen ciphertext attacks

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