Why do you need to hash 2 random numbers and a key instead of hashing using only one random number?

I depends on what you're doing, which you don't really say. Hashing is a general technique that involves neither keys nor random numbers. Salting involves random numbers, and keys are used for encryption or authentication.

I depends on what you're doing, which you don't really say. Hashing is a general technique that involves neither keys nor random numbers. Salting involves random numbers, and keys are used for encryption or authentication.

Reading between the lines of your question, it appears that you're using keys for authentication, but then why would you be sending them back to the sender at all? You might use two salts in a protocol like you describe if the two sides involved don't fully trust each other to use a proper salt -- by having both sides provide a salt, both can be assured that the salt is truly random and doesn't involve a back door or a replay attack.

I m not sure but I yhink you should encode your answer too. en.wikipedia.org/wiki/Three-pass_protocol.

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