Abstract— In these days use of digital data exchange is
increasing day by day in every field. Information security plays
very important role in storing and transmitting the data. When
we transmit a multimedia data such as audio, video, images etc.
over the network, cryptography provides security. In
cryptography, we encode data before sending it and decode it on
receiving, for this purpose, we use many cryptographic
algorithms. AES and DES are most commonly used
cryptographic algorithms. AES provides the encryption to secure
the data before the transmission and DES also provides security
as AES. In this paper we discussed AES and DES and their
comparison using MATLAB software .After applying AES and
DES, we compare their result on the basis of avalanche effect,