Unit 3-Symmetric Key Crypto_Part8

Unit 3-Symmetric Key Crypto_Part8 - Y does not step, and Z...

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Unit 3 - 15 A5/1, cont. Each value is a single bit Key is used as initial fill of registers Each register steps or not, based on ( x 8 , y 10 , z 10 ) Keystream bit is XOR of right bits of registers y 0 y 1 y 2 y 3 y 4 y 5 y 6 y 7 y 8 y 9 y 10 y 11 y 12 y 13 y 14 y 15 y 16 y 17 y 18 y 19 y 20 y 21 z 0 z 1 z 2 z 3 z 4 z 5 z 6 z 7 z 8 z 9 z 10 z 11 z 12 z 13 z 14 z 15 z 16 z 17 z 18 z 19 z 20 z 21 z 22 X Y Z x 0 x 1 x 2 x 3 x 4 x 5 x 6 x 7 x 8 x 9 x 10 x 11 x 12 x 13 x 14 x 15 x 16 x 17 x 18
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Unit 3 - 16 A5/1, Example In this example, m = maj ( x 8 , y 10 , z 10 ) = maj ( 1 , 0 , 1 ) = 1 Register X steps,
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Unformatted text preview: Y does not step, and Z steps Keystream bit is XOR of right bits of registers Here, keystream bit will be 1 0 = 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 1 X Y Z 1 1 1 1 1 1 1 1 1 1...
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This note was uploaded on 03/17/2011 for the course ECE 4472 taught by Professor Ouda during the Fall '10 term at UWO.

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Unit 3-Symmetric Key Crypto_Part8 - Y does not step, and Z...

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