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The Problems to Solve Senders want to know if what they’re doing doesn’t work New hashes, algorithms that are not yet widely deployed Implementors want to get back forensic evidence when verification failures occur Especially important at the Interop event Participants were asked to make sure their autoresponders returned forensic data on failures Need to get back canonical forms seen at the verifier To compare what the verifier got to what the signer signed Pinpoints in-transit modifications |