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Does anyone know a good paper where the process of signature verification is explained (message+signature+public key = valid/not_valid) ??? And I mean it at a low level, with the code or pseudo-code of the algorithms doing the verification or similar. All sources I have found explain it with the verification process being pretty much a black box.
I know StackExchange is not the place to ask for references, but I haven't found what I am looking for, so someone might now a good source...
Thank you all in advance. Cheers