Class-6-4-DES

Class-6-4-DES - 5 = 0101 next next next next FURTHER...

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THE DATA ENCRYPTION STANDARD (DES) For details see the Federal Information Processing Standards Publication 46-3 posted on our website next
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16 STAGES DES next
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+ + + + 64 bits of Plaintext Initial Permutation 32 left bits 32 right bits next
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16 STAGES The F Function next
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64 bits of Ciphertext Inverse Permutation + + Notice the end of the iteration + next
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INITIAL PERMUTATION INVERSE PERMUTATION next
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EXPANSION SCHEDULE next next next next
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COMPRESSION SCHEDULE the row is 01=1 The column is 1101 = 13 For input 0 1101 1 The output is
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Unformatted text preview: 5 = 0101 next next next next FURTHER MISH-MUSHING next next next next THE FIRST 4 COMPRESSION BOXES next next next THE LAST 4 COMPRESSION BOXES next next next KEY PROCESSING next 64 bits 28 bits 28 bits next next 48 bits PERMUTED CHOICES next A 64 bit key bits 8, 16, 24, 32, 40, 48, 56, 64 are not used Feeding the ciphertext with key schedule in reverse yields back the Plaintext 64 bits of Ciphertext Initial Permutation + next Inverse Permutation + +...
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This note was uploaded on 09/22/2010 for the course MATH MATH187 taught by Professor Math187 during the Spring '10 term at UCSD.

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Class-6-4-DES - 5 = 0101 next next next next FURTHER...

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