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1

Re-encrypting with the same pad is insecure, unless what your encrypting is already encrypted with a non-used pad or other system.


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No, there are no problems (which I could see) with re-using the signature key in this scenario. There are two potential concerns: It may be possible to learn something about the private key using the challenge-response protocol It may be possible to re-use the signature of a run of the challenge-response protocol for TLS The first concern is clearly ...



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