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Answer by Tom Leek for Using AES as a Stream Cipher
CTR mode is about encrypting data by generating a key dependent pseudo-random stream and XORing it with the data; so what you describe really is CTR mode, and you don't have to to the XOR yourself....
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I need to send a lot of small messages that are usually between 128 bits and 256 bits long, and each message is encrypted with a separate 128 bit AES key. Therefore, to send each message with the key...
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