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user 51118
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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How to stop an attacker from repeating the same ciphertext?
Now, I am very new to cryptography, so I will be programming this hardware with an already pre-existing library that supports AES-128, AES-192 and AES-256 in ECB and CBC modes. … Let's say that the PC encripts a message like "MACHINE1 ON" using AES-256 with a secret key that the hardware module knows. …
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