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

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Can a secure MAC break if the adversary is given oracle access to Verify?

In the Mac-forge experiment, the adversary is given access to a tag-generation oracle, which generates a tag for each message given by the adversary. The adversary's task is to generate a valid tag on ...
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Can an adversary forge an RSA signature while not having seen the message?

Can an adversary who hasen't seen the message before, forge the signature of that message? The adversary has seen $σ_1 = (m_1)^d \bmod N$ and $σ_2 = (m_2)^d \bmod N$ He forges $m' = m_1\cdot m_2$ $σ'...