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Authentication is successfully validating that an entity you are communicating with is actually who they claim to be. The entity typically demonstrates who they are by showing they possess a secret that only they could know.

14 votes

advances in usability for cryptography/authentication

This is an active area of research. There have been attempts at creating usable security tools and lots of user studies of existing tools (typically with critical results). A good anthology for work …
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2 votes

Helper data authentication in PUFs

You can also think about PUFs in terms of challenges/responses. If I want to authenticate you with a PUF, I need to be in possession of it first. I make a list of challenges and determine, for each, t …
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6 votes
Accepted

RSA-based authentication and key-agreement protocol

What you are looking for is authenticated key agreement with perfect forward secrecy based on certificates. First, to address @Paulo's comment, TLS/SSL does provide this functionality with any of the …
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2 votes

Hash or encryption function for challenge-response protocol?

You need to first understand the security properties you are trying to achieve. Possible security goals: It shouldn't be possible to answer convincingly if you don't know the secret If you do know t …
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3 votes

What are advantages of using a HMAC over RSA with SHA-1 hashes?

The main advantage is speed: HMACs are much faster than an RSA signature. Given the question says you are signing SHA-1 hashes, there is no need to use a hash function in composition with RSA since t …
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