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The DES ( Data Encryption Standard ) algorithm is a symmetric - key block cipher created in the early 1 9 7 0 s by
The DES Data Encryption Standard algorithm is a symmetrickey block cipher
created in the early s by an IBM team and adopted by the National Institute
of Standards and Technology NIST The algorithm takes the plain text in bit
blocks and converts them into ciphertext using bit keys. Simplified DES,
developed by Professor Edward Schaefer of Santa Clara University, is an
educational rather than a secure encryption algorithm
The SDES encryption algorithm takes an bit block of plaintext
example: and a bit key as input and produces an bit
block of ciphertext as output.
The SDES decryption algorithm takes an bit block of ciphertext and the
same bit key used to produce that ciphertext as input and produces the
original bit block of plaintext.
The SDES encryption algorithm takes an bit block of plaintext
example: and a bit key as input and produces an bit
block of ciphertext as output. The SDES decryption algorithm takes an
bit block of ciphertext and the same bit key used to produce that
ciphertext as input and produces the original bit block of plaintext.
Consider the SDES shown on the next page. The keys k and k can be derived
using the functions P Shift, and P Given the below definit
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