Nonce

Nonce is a random number generated to used just once during a communication session. The main purpose of it is to prevent Replay Attack#.

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Replay Attack

Replay Attack could be prevented using Nonce#, where the machines will use an arbitrary number (random) embedded to the communication Protocol to recognise each other.
Randomness

There are many use cases in Cryptography# relies on random numbers such as Nonce# in authentication protocols, session keys, public key generation, and keystream for One-Time Pad.
Kerberos Version 5

\(\text{Nonce}\) is a Nonce#