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The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is

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The Plaintext for the Ciphertext 00001111, given that the key is 1111111111 is

(a) 01100111

(b) 00001010

(c) 11111111

(d) 01101101

The question was asked in homework.

I would like to ask this question from The Simplified Data Encryption Standard (SDES) topic in section Block Ciphers and the Data Encryption Standard of Cryptograph & Network Security

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Best answer
The correct option is (c) 11111111

Explanation: Perform the SDES Decryption algorithm and compute the cipher text.

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