This paper described fast and robust approach of text encryption and decryption based on Pascal matrix. The technique of encryption can be applied on both Arabic and English text. The results shows that the ciphered text unintelligible and rubush for the interuder or hukers. The encryption scheme usually uses a pseudo-random encryption key generated by an algorithm. All this done by using Pascal matrix. Encryption and decryption simulated using MATLAB version 10 and notepad ++to write the input text.

The data communication has been growing in present day. Therefore, the data encryption became very essential in secured data transmission and storage and protecting data contents from intruder and unauthorized persons. In this paper, a fast technique for text encryption depending on genetic algorithm is presented. The encryption approach is achieved by the genetic operators Crossover and mutation. The encryption proposal technique based on dividing the plain text characters into pairs, and applying the crossover operation between them, followed by the mutation operation to get the encrypted text. The experimental results show that the proposal provides an important improvement in encryption rate with comparatively high-speed Processing.

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This research aims to build a cipher system using back propagation Algorithm with artificial neural network to encrypt any Arabic text and to prevent any data attack during the transition process. Encryption information holds four stages: 1) A neural network was trained by using back propagation algorithm to encrypt the whole input Arabic text and grasp final weights and consider these weights as a public key.2) Training a second neural network by using back propagation algorithm to decrypt the input Arabic text of first stage and grasp weights and consider the weights as a private key.3) Encrypt any Arabic text by using the weights obtained from first stage. 4) Decrypt the Arabic text from third stage by using the weights obtained from second stage. The four stages are achieved prosperously for data encryption process and decryption. This work is executed by using Matlab program version 7 and Notepad++ for writing text because it supports Arabic numbers under windows 7 as operating system.