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So is PKCS7 a signature format or a certificate format or both? Neither. PKCS7 is now Cryptographic Message Syntax(CMS). From the RFC 5652: This syntax is used to digitally sign, digest, authenticate, or encrypt arbitrary message content. CMS enables interoperability between different products which can operate on the same document without ...


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TL;DR: Using words instead of strings / images may be a good solution for short, easy-to-verify codes and using locality / time dependent verification codes strengthens short hashes as would using password-hashes. Additionally to the improvements to comparability of the hash proposed by A. Toumantsev, I will propose three extra measures which I believe may ...


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I'm not commenting on the security side of the solution, there are real experts here who can help with this (or turn your idea right down ;) ). However, assuming your solution (with SHA256) is acceptable and secure, your main problem seems to be that "carefully comparing all the digits of a SHA-256 hash .. takes a while". Indeed, comparing a string of 64 ...



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