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AVALANCHE EFFECT IN THE FAMILY OF BLOCK CIPHERS “SD-(n,k)” - page 14 / 29

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Avalanche effect in encryption

Results for “SD4-(40, k)” different modes CBC, OFB and CFB:

Random generated key and plaintext of 10000 bits

IV – first n letter from key

For OFB and CFB parameter r=8

Flipping one bit in last 4k letters in key cause already for k=1 50% different bits in ciphertext in all modes

Standard deviation varies between 0,28 and 0,49 in all modes

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