Unit 3-Symmetric Key Crypto_Part19

Unit 3-Symmetric Key Crypto_Part19 - bit key for the given...

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Unit 3 - 37 Key schedule generates subkey Each of the 16 stages uses a 48 bit subkey which is derived from the initial 64 bit key. The 56 bits are divided into left (LK) and right halves (RK). Each half is shifted left by 1 or 2 bit positions (it varies depending on the stage). The new 56 bits are compressed by throwing out 8 bits to create the 48
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Unformatted text preview: bit key for the given stage. 48 Unit 3 - 38 DES Subkey - Division 56 bit DES key, numbered 0,1,2,,55 Left half key bits, LK Right half key bits, RK 49 42 35 28 21 14 7 50 43 36 29 22 15 8 1 51 44 37 30 23 16 9 2 52 45 38 31 55 48 41 34 27 20 13 6 54 47 40 33 26 19 12 5 53 46 39 32 25 18 11 4 24 17 10 3...
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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_Part19 - bit key for the given...

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