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user 56134
AES (Advanced Encryption Standard) is a symmetrical block-cipher algorithm with a 128-bit block size, and key sizes of 128, 192 or 256 bits.
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Reverse cascaded AES encryption
For example: Let's assume that we encrypt a plaintext using AES-CTR and encrypt the output again with AES-CTR using a different key. … However, I do not know if this keystream can be generated by the AES algorithm and if we can calculate the respective key efficiently. …
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