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(1 point) A block cipher with encryption function e when used in OFB mode produces a keystream
of pseudo-random blocks s1,s2,s3, where s1=e(IV) and si+1=e(si). These blocks are then used as
a stream cipher to yield ciphertexts yi=sixi where xi is the i th block of plaintext. What would
happen if, by coincidence, s3=s20. Would this threaten the security of the system? How?

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1 point A block cipher with encryption function e when use.pdf

  • 1. (1 point) A block cipher with encryption function e when used in OFB mode produces a keystream of pseudo-random blocks s1,s2,s3, where s1=e(IV) and si+1=e(si). These blocks are then used as a stream cipher to yield ciphertexts yi=sixi where xi is the i th block of plaintext. What would happen if, by coincidence, s3=s20. Would this threaten the security of the system? How?