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The system which has insufficient information available to crypt-analyst is

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The system which has insufficient information available to crypt-analyst is

(a) One-time pad

(b) Unconditionally secure

(c) One-time pad & Unconditionally secure

(d) None of the mentioned

I got this question in semester exam.

I'm obligated to ask this question of Cipher Systems and Secrecy of Cipher Systems in division Spread Spectrum Techniques of Digital Communications

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Right answer is (c) One-time pad & Unconditionally secure

To elaborate: Unconditionally secure system is the one which has insufficient information available to crypt-analyst. One such system is one-time pad.

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