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AVALANCHE EFFECT IN THE FAMILY OF BLOCK CIPHERS “SD-(n,k)” - page 22 / 29

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Avalanche effect in decryption

Substract-with-borrow random number generator with period 21492

Examination for each k={1,2,...,20} and for each subfamilies “SD4-(40,k)”, “SD16-(20,k)” and “SD256-(10,k)”

For every k, we use 1000 different random generated pairs of ciphertext and keys

We compute mean and standard deviation of bit differences in plaintext

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