Abstract:
Todays, computers security is needed to
protect data and to thwart the hackers.
Cryptanalysis on symmetric key cryptography is
encouraging the use of larger key sizes and complex
algorithms to achieve an unbreakable state. To make
encryption process, symmetric key cryptography that
uses the same key for encryption of plain image also
generates cipher image. Decryption of the cipher
image to get the original plain image is done by
decryption. This method is used to secure data for
transmission over open networks such as the
internet. In this system, comparison of execution
times for symmetric key cryptography is presented
along with the algorithm of RC5 and RC6 .These are
suitable to build a secure system in the military
environment, video communication and so on.
