A High Security Symmetric Encryption and Decryption Method for Strings

Abstract

The invention relates to a high security character string symmetrical encryption and decryption method. The encryption method comprises the steps of receiving a to-be-encrypted character string, an encryption vector and encryption offset; generating an encryption dynamic factor according to the encryption vector, and splitting the to-be-encrypted character string, thereby obtaining two sections ofsplit character strings; and generating a time encryption factor according to current time, adding the time encryption factor to the two sections of split character strings, combining the split character strings, and encrypting the combined character string according to the encryption offset, thereby obtaining the encrypted character string. The decryption method is reverse operation of the encryption method. Difference is calculated through utilization of a current time decryption factor and the time encryption factor extracted after the split is carried out. Decryption is carried out if a difference value does not exceed a threshold. Decryption failure is returned if the difference value exceeds the threshold. Compared with the prior art, the methods have the advantages that the security performance is high, the exhaustion break is prevented, and the break difficulty is high.

Description

technical field [0001] The invention relates to the field of computer information security, in particular to a high-safety string symmetric encryption and decryption method. Background technique [0002] Encryption and decryption of software is a fascinating field of study that can be closely integrated with almost any kind of computer technology—cryptography, programming languages, operating systems, data structures. The existing commonly used encryption technology is symmetric encryption, which uses symmetric cipher coding technology, and its feature is that the same key is used for file encryption and decryption, that is, the encryption key can also be used as the decryption key. It is called a symmetric encryption algorithm in science. The symmetric encryption algorithm is simple and quick to use, the key is short, and it is difficult to decipher. In addition to the Data Encryption Standard (DES), another symmetric key encryption system is the International Data Encrypti...

AI Technical Summary

Problems solved by technology

With the continuous development of computer system capabilities, the security of DES will be much weaker than when it first appeared. With the continuous breakthrough of quantum computing, the sharp leap in its computer capabilities will bring new challenges to network security—many encryption algorithms will become quite fragile

Images