Authentication Methods
Authentication is implemented using digital signatures. Digital signatures are most commonly created by taking some message text, such as information unique to a device or person, along with a key, through a hashing function. The digital signature is like the signature that you would use to sign a check, your fingerprint, or a retinal scan of your eye: it’s something unique to you and no one else. Digital signatures are used to implement non-repudiation in VPNs: being able to prove, with certainty, the identity of a device.
The last part of this chapter on VPN technologies will cover authentication methods: how two peers can recognize that when they establish a connection to each other, they are really connecting to the ...
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