Simple – Data Encryption Standard

The S-DES (Simple – Data Encryption Standard) encryption algorithm takes an 8-bit block of plaintext (examples: 10111101) and a 10-bit key as input and produces an 8-bit block of ciphertext as output.

I wrote some codes which involved this encryption algrithm. These codes are UDP client and server socket program that made using C language under UNIX environment. In this program,  client would send messages to the server, but before the client sent it, the messege should be encypted first using S-DES by inputing the 10 digit of key and the message turn become chipertext . Once the encrypted message (chipertext) were sent to the server, the server only could read the message if it knows the key to decrypt the chipertext to convert it become plain text.

To learn more about the S-DES algorithm, download the tutorial here ns_sdes .

To download the sourcecoude, click here
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