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2 votes

Crack RSA with $e$ and $d$?

Since this is a CTF, I won't give quite a full solution, just try to unstuck the OP (who seemingly made significant progress). We are given $e$ and $d$. That makes us sure that $e\,d\equiv1\pmod{\...
  • 132k
2 votes

Stuck on a cryptanalytical research project

There is already a good answer. In addition, if you think actual cryptosystems used today are at risk but you believe "clock arithmetic" works makes me think actual (public key) ...
  • 19.1k
11 votes

Stuck on a cryptanalytical research project

The fact that your attack only works when you're using "normal math" and not "cryptographical math" (by which I assume you probably mean modular arithmetic, or perhaps arithmetic ...
11 votes
Accepted

Is it insecure to sign the value 0 with ElGamal?

Is it insecure to sign the plaintext 0 with ElGamal signature algorithm? It is insecure to verify the plaintext that hashes to 0 with the ElGamal signature algorithm, because anyone can generate such ...
  • 139k

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