Shared Secret Based Hash Authentication
Before I explain this, let me first define what authentication actually is, and more importantly, what it’s not.
Authentication is when a user proves his identity. In other words, Authentication proves that you are what you say you are. It can be considered as an identification card – an item given by a trusted authority that the requester can use as evidence to prove his identity. Authentication doesn’t mean to prove a right to access something rather it is just about recognizing a user.
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