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Do I have to store my encryption Keys, in order to Decrypt my strings?

If you use AES, you must have the same key and IV to decrypt data. You shouldn't look for any option to make your key or IV predictable. That is, if you can easily re-generate it, guess what?..

You probably want to post what you trying to achieve. Seems like AES may not be the right choice. You may need to look at public-private key cryptography, where one key encrypts, the other decrypts. You may also want to use a holistic solution that includes several steps.

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