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Generally you should try and avoid deriving keys from passwords on embedded devices or passwords. There are a few strategies that could be used. First of all, you can try and design a system that doesn't use a password. Passwords are very tricky to secure, and password hashing algorithms (or, in this case, rather Password Based Key Derivation Function or ...


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There aren't many KDFs that will be faster on an AVR than PBKDF2. In your case, it's likely that the only thing you can do is find a hash which can be implemented efficiently on an ATmega2560, and implement it with as many optimizations as possible. A highly-optimized implementation of a hash algorithm is likely to improve speed significantly. That's really ...


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