Abstract: Computer communication needs to protect data during their transmission for secure transactions. Secure electronic transactions are essential step on the road to electronic commerce and are thus in high demand. Modern cryptography uses the basic ideas as traditional cryptography, transpositions and substitution, but its emphasis is different. The technique of traditional cryptography deals with simple algorithms and relied on very long keys. With conventional encryption, two parties share a single encryption and decryption key. The principal challenge with conventional encryption is the distribution and protection of keys. The advantage of stream ciphers over block ciphers is that it can easily implemented in hardware with relatively few components and is much faster. The fact that bits are encrypted individually means that, individual bit errors in a ciphertext do not propagate and the only corresponding plaintext bits are destroyed. Here, four stream cipher algorithms: Onetime pad, RC4, SEAL and A5 are implemented in C programming language. Compared these algorithms with each other and then the integrated software combining all of stream ciphers. The principal challenge of conventional encryption is the distribution and the protection of the keys. Integrated software has been developed combining all the four algorithms of stream ciphers. One of these stream cipher algorithms can be selected for security and message transactions with confidentiality.
M. Ismail Jabiullah and M Lutfar Rahman , 2006. Stream Ciphers for Message Confidentiality. Asian Journal of Information Technology, 5: 358-361.