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The document discusses symmetric key ciphers and provides details about: 1) Symmetric key ciphers like DES use the same key to encrypt and decrypt data. DES encrypts 64-bit blocks using a 56-bit key. 2) The DES algorithm transforms plaintext into ciphertext in 3 phases - an initial permutation, 16 rounds of encryption, and a final permutation. 3) The 56-bit key is initially permuted and then used to generate subkeys for each of the 16 rounds through circular shifts and permutations.

Author

Vasantha Kumar V

Language

EN