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2

I assume you are familiar with $P$ and $NP$. Also, my knowledge of SNARKs is based mostly on the work of Parno et al., other work may differ in some fine details. So, a SNARK is a succinct non-interactive argument of knowledge. Leaving the "knowledge" part aside for the moment, let's look at "plain" succinct non-interactive arguments (called SNARGs in the ...

3

My understanding of the term 'pepper' is that it more matches your definition 2, in that a pepper is an unknown salt, which makes it a cryptographic secret, but not a key. However, in use it is not as limited by either of your definitions: The pepper can be different (or random) for all users (like a salt). The pepper can be the same for all users (like a ...

2

From the Catena paper, version 2. A salt refers to an additional random input value for the password scrambler, stored together with the password hash. It enables a password scrambler to derive lots of different password hashes from a single password like an initialization vector enables an encryption scheme to derive lots of different ciphertexts from a ...

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