Answer :
The single most important feature of stream encryption that could prevent reused key streams is incorporating nonce.
What is nonce?
Nonce is a randomly generated number or pseudo-number that been used in communication system to prevent the old communications to be reused. The nonce is issued by authentication protocol.
Encryption is a protocol to scrambling the data to prevent anyone to read or understand the information. Only authorized parties can read and understand the information with decryption method.
In stream encryption, encryption combines data with a pseudo number known as a keystream by using a nonce so that the same keystream will not be reused and will only use a new pseudo number.
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