Authenticity is a functionality of cryptography that verifies that the sender of the message is who he claimed to be.

This functionality is implemented with the digital signature functionality.

And as a side effect, it allows a signed document to be used as credentials for authentication. Generally, a signed certificate is presented to the service to log in. To know more about it, see What is Sender authentication ? (Public Key Authentication based, Certificate-based in Cryptography)

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graphy is the science of cryptographic algorithms (known as Cipher) that implements the following functionalities: Data Integrity - the message (data) was not altered during transit Authenticity -...
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Security regroups many subject area. The most known are: Identity management with: authentication (user/password) and its method (ldap, table, ...) authorization (group, privileges and role, object...

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