Why m = md5(s) or m = e(s) with rsa encryption

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Suppose we have a very short secret s (e.g., a single bit or even a Social Security number), and we wish to send someone else a message m now that will not reveal s but that can be used later to verify that we did know s. Explain why m = MD5(s) or m = E(s) with RSA encryption would not be secure choices, and suggest a better choice.

Reference no: EM131045494

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