Reversible tamper-proof data encryption and decryption method based on encryption and digest algorithms

Abstract

The invention discloses a reversible tamper-proof data encryption and decryption method based on encryption and digest algorithms. Main components for the method are as follows: two devices used for data encryption and decryption on a network. According to the method, the discreteness of the MD5 and the reversibility of the DES are combined, so that the safety of an encrypted ciphertext in a network transmission process is increased, and the ciphertext is prevented from being tampered and then transmitted after the ciphertext is tampered in the network transmission process, namely the tamper-proof performance is achieved; and meanwhile, after the ciphertext is received by a correct terminal, the ciphertext is decrypted to obtain plaintext data, namely the reversibility is achieved.

Description

technical field [0001] The invention belongs to the field of computer communication, and relates to a method for reversibly anti-tampering encryption and decryption data based on encryption and digest algorithm. Background technique [0002] In the rapidly developing Internet era, data is transmitted on various network devices. Data is exposed to various network devices during transmission. There is a risk of data being intercepted, decrypted, tampered with by network equipment, and then transmitted. In order to improve the security of data during the transmission of network equipment, it is extremely important to use more complex algorithms for encrypting and decrypting data. [0003] The full name of the MD5 message digest algorithm is Message-Digest Algorithm 5. It is one of the hash algorithms widely used by computers. It has the following characteristics: 1) It is irreversible, that is, there is no systematic method to calculate the original plaintext information cont...

AI Technical Summary

Problems solved by technology

[0005] From the above two characteristics, we can know that the MD5 algorithm is irreversible, and the summary information obtained after the plaintext data is passed through the MD5 algorithm cannot be decrypted to the plaintext through the summary information.

Once the ciphertext encrypted by the DES algorithm is intercepted, the ciphertext can be decrypted to the plaintext through the corresponding decryption algorithm, which cannot ensure the security of the data