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El Gamal Decryption with Big Numbers [on hold]

I have a message encrypted in ElGamal. I was wanting help on how to decrypt it. Here is the data that I was given: p value g value h value x value y value c value How would I go about doing this. ...
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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 ...
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Malleability of ElGamal and Hashed ElGamal

Question: Suppose A encrypts a number $x$ which indicates her bid on a contract, using ElGamal encryption. Say that the encryption of $x$ produces a ciphertext $c$. Explain how E can modify $c$ to ...