[Annotation] To avoid this situation, the sender of a message MUST generate a fresh random four-byte "reuse guard" value and XOR it with the first four bytes of the nonce from the key schedule before using the nonce for encryption.

[duesee]

To avoid this situation, the sender of a message MUST generate a
fresh random four-byte "reuse guard" value and XOR it with the first
four bytes of the nonce from the key schedule before using the nonce
for encryption.

---

Annotation

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