A 64-bit long message “10110100 01010101 01001010 10101001 10101001 10101001
01010101 11111010” (ignore the “spaces”) was encrypted with DES using the key “1011010 0101101 0111101 0101101 0110101 0110101 0110100 1101101” in ECB mode and following ciphertext was obtained “10010101 01101010 10111101 10001001 10101111 01010101 10101010 10001001”
Can you figure out the ciphertext when the message “01001011 10101010 10110101
01010110 01010110 01010110 10101010 00000101” is encrypted with DES ECB using the key “0100101 1010010 1000010 1010010 1001010 1001010 1001011 0010010”? If so, explain the details how. If now, explain the reason why.
[Hint: You don’t need to write a program (in fact, the values given above are all imaginary – when you encrypt the given message with the given key, you WILL NOT get the given ciphertext. You only need to know how DES works (which was explained in the class)]
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2 responses so far ↓
1 Brittany T // Sep 16, 2008
Dude is this even possible..im totally stumped on this…u shud give the answer
2 awaywa // Sep 16, 2008
By complementation:
01101010 10010101 01000010 01110110 01010000 10101010 01010101 01110110
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