# All Questions

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### Safe way to generate different encrypted output from the “same” plaintext

Imagine I want to send imaginary defcon levels to another party over the internet. I know there are good protocols for this like SSL, but lets say I only have a blackbox tool where I can input an AES ...
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### Is it OK to use a hash of the key as nonce for AES GCM?

I don't see an immediate risk of using the hash of the key as the nonce for AES GCM. Is there something I could be overlooking?
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### Defining format-preserving encryption for natural language

Assume we have plaintext in natural language. Can we use format-preserving encryption in such a way that the produced ciphertext cannot be distinguished from natural language?