IV Generator
Generate random initialization vectors (IVs) for AES encryption.
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How it works
An IV (initialization vector) or nonce makes each encryption unique, even with the same key and message. For AES-GCM use 12 random bytes and never reuse one with the same key; for CBC and CTR use 16 bytes (choose “Hex secret” with 16 bytes). IVs aren't secret: they're usually stored next to the ciphertext.