Forgery is the process of making, adapting, or imitating objects, statistics, or documents with the intent to deceive.

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Why do we need to hash both the message and the $h$ value in ElGamal signature?

The professor left us a question on ElGamal signatures: Given the hash function $H$ and message $M$, choose a random $r$ and compute $h=g^r$ and $H(M||h)$. Show that, if $H(M)$ is used instead of ...
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Probability of an ed25519 selective forgery?

What is the expected number of trials required to selectively forge ed25519? Please include how it is calculated.