Computer Science · Cryptography and Ciphers
Consider a 4-bit plaintext and ciphertext system using a 3-bit key K. The encryption algorithm takes the 1st and 3rd bits of K, interprets these two bits as a decimal integer, squares it, and converts the result into a 4-bit binary pattern which is then XORed with the plaintext. If plaintext = 0111 and key K = 101, what are the ciphertext and the decrypted original text?
Verified Solution4 OptionsUpdated: October 2026👁️1 View
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- 11100 and 0011
- 21100 and 1001
- 31001 and 1100
- 41110 and 0111✓
Correct answer
1110 and 0111
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