摘要：In this paper, we implemented five of the most popular and used encryption algorithms in the world, AES, DES, RC4, RC5, and RSA. We made a comparison among these algorithms on the same OS, and another comparison between the same algorithms on different OSs, these comparisons is the term of time performance. The idea behind this project is the importance of security nowadays, especially when the Internet became widely used by millions of peoples for secured transactions, so, these transactions may contain sensitive data like Password, Credit Card Number, or others, these sensitive data must be transmitted over a secure channel to avoid any attack on it. Also, the thing which is differentiate our research is using a combined file of both Arabic and English symbols, the encryption and decryption processes for Arabic symbols require more additional code and algorithm to deal with Arabic symbols
