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What is an authentication?

What is an authentication? Here are some definitions.

Noun
  1. something which validates or confirms the authenticity of something
  2. (computing) proof of the identity of a user logging on to some network
  3. a hallmark or assay-mark on a piece of metalwork
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This process uses a dynamic authentication code that changes each time the contactless card is used based on a unique algorithm.
They will be stamped with his seal, numbered by his wife Tessa and will be accompanied by a letter of authentication.
Will it be possible for Movable Type and TypePad users to plug into a non-SixApart authentication system?
The authentication server can be located on the local wired network or elsewhere on the Internet.
Online authentication works if you have a shared secret, but there are no secrets in a credit bureau's database because that data is for sale.
Brute force dictionary attacks attempt to compromise this authentication procedure by methodically testing every possible password.

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