TWO WAYS OF MESSAGE BLOCKS REARRANGEMENT TO PROTECT THE MESSAGE

An efficient, easy to implement and flexible method of message cryptography will be proposed. The method willenhance the speed of standard and chaotic methods of message cryptography by providing a good speed comparingwith them. The method will provide a high level of security, it will use a private key of length equal 384 bits (forone round), this length will provide a key space capable to resist hacking attacks, and the decrypted message will besensitive to the selected private key. The proposed method will be simple, it will use a simple chaotic logistic mapmodel to generate the required secret keys, and it will use a simple message blocks-characters rearrangement toapply message encryption-decryption. The method will not alter the characters values, it will not need dataconversion, and it will not require the complex of operations used in other methods, thus the program code will beminimized. The proposed method will flexible, it will provide the sender with the ability to change the number ofrounds, the block size and the private key length, making these changes will not affect the encryption and decryptionfunctions.The proposed method will be implemented using various short and long messages, the following result analysis willbe performed: Speed, quality and sensitivity, and the results will be used to prove that the proposed method willsatisfy the requirement of good crypto method.