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0—1-1-11 Block Ciphers Block ciphers (encryption algorithms) transform a fixed-length block of plaintext into a block of ciphertext of the same length. Applying the reverse transformation to the ciphertext block, using the same secret key, results in decryption. The fixed length (block size) for many block ciphers is now typically 128 bits (Data Encryption Standard [DES] has a block size of 64 bits). Block algorithms always almost result in output data being larger than input data, as they need to work on chunks of specific sizes, and the length of ciphertext is therefore a multiple of the block size.

0 Copyright © 2003, Cisco Systems, Inc. RSA Basics • Each entity has two keys: – Public key (can be published) – Private key (must be kept secret) • It is not feasible to determine the private key from the public key. • One key encrypts, the other key decrypts a message. • Those keys are long-term (months/years). © 2003, Cisco Systems, Inc. All rights reserved. 0—1-1-30 The RSA algorithm is based on the fact that each entity has two keys, a public key and a private key. The public key can be published and given away, but the private key must be kept very secret.

That is, instead of applying subkeys 1 to 16, subkeys 16 to 1 are applied. Copyright © 2003, Cisco Systems, Inc. Encryption 1-1-21 One DES Round © 2003, Cisco Systems, Inc. All rights reserved. 0—1-1-16 The figure illustrates how the right half (32 bits) of the initial 64-bit block in the previous figure moves through one of the 16 DES rounds. DES provides it security by mixing the bits of the key with the bits of the data in a deterministic manner. Notice that the block expands and contracts as it moves through the round.

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Cisco Designing VPN Security


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