Nt1330 Unit 3 Data Encryption Algorithm

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Data encryption standard is symmetric key cryptography algorithm.It was developed in 1977 by IBM. It uses 64 bit block size and 56 bits key size.The DES is a block cipher algorithm.It uses 56-bit key to encrypt the message.This algorithm consist of series of substitutions and permutation on each block of 64 bit message, which is then EX-OR with input. This process is repeated 16 times. Due to 16 rounds of DES algorithm it is more secure . Very high throughput is achieved using this

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