The invention discloses an
encryption and decryption method for Chinese and English character strings, which comprises the following steps of: converting a certain section of Chinese and English character string into numerical data one by one, and converting the numerical data into 7bits binary data to obtain a binary sequence; secondly, scrambling the binary sequence according to the position change rules before and after the
chaotic signals are ranked; through a cyclic operation of single iteration of a
chaotic system, shifting of binary grouping sequences one by one and parameter adjustmentof the
chaotic system, completing shifting of the scrambled binary sequences; and finally, carrying out numerical value and character conversion to obtain an encrypted
ciphertext of the Chinese and English character string, and decrypting the
ciphertext through a similar method to restore the original Chinese and English character string. According to the method, the
password characteristic of the chaotic
signal is utilized to encrypt / decrypt a binary sequence formed by converting Chinese and English character strings through scrambling, grouping, shifting and other operations, known / selectedplaintext attacks and only
ciphertext attacks can be resisted, and the
encryption and decryption safety of the Chinese and English character strings is ensured.