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Absolutely. There is no risk from appending the nounce/iv to encrypted text.


As per OpenID Connect Core documentation: The nonce parameter value needs to include per-session state and be unguessable to attackers. One method to achieve this for Web Server Clients is to store a cryptographically random value as an HttpOnly session cookie and use a cryptographic hash of the value as the nonce parameter. In that case, the ...


In TLS 1.2 and before, the Random field of the Client and Server Hello messages indeed have a random bytes part and a timestamp. The purpose of the timestamp is to increase the chance to have a unique value even if the random number generator is flawed and produces duplicate random bytes. This however is not the current practice, modern TLS implementations ...

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