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Why $1\leq r\leq p-1$ verification is needed for (hashed) Elgamal signature?

I am reading the "Handbook of Applied Cryptography" by Menezes et al. (hashed) ElGamal Signature verification in this book talks about verification of $1\leq r\leq p-1$. Subsequently, this ...
mxant's user avatar
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0 votes
0 answers
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Using GP/PARI how would you solve this randomised Elgamal question?

I know how to solve this question manually, but I don't know how to solve it using the program gp/pari. It is based on randomised Elgamal Let p = 739. Given the following ciphertext of some message m1 ...
Sarah's user avatar
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5 votes
2 answers
590 views

Elgamal test vectors

I know that Elgamal algorithms have fallen out of fashion, and they are not included in any widespread cryptographic standard nowadays. However, they are still present in several popular crypto ...
SquareRootOfTwentyThree's user avatar