The Research of Dynamic Encryption & Decryption Methods Based on the Binary Random Hash

This paper proposes a new method of encryption and decryption based on stream cipher. The method completely abandoned the traditional mathematical calculation method. Its main principle is to using the key to get a binary random Hash mapping; the plaintext will be evenly dispersed in a known binary random Hash, and then mapped to the cipher space. This encryption method has a very strong randomness and collision resistance. The algorithm analysis shows that the time and space complexity of the method is the same as the traditional stream cipher algorithm, both of which are o (n). Finally, we test the time efficiency of the method, and the experimental results show that block and multithreading technology will greatly improve the encryption efficiency for large files.