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Which of these is not a mode that DES operates in?
CBC
OFB
ECB
FFB
The correct answer is 'FFB'. DES encryption algorithm defines how a single 64-bit plaintext block can be encrypted. (FIPS) Federal Information Processing Standards Publication 81 published in 1980 provided the following block encryption operation modes: ECB - Electronic Code Book operation mode; CBC - Cipher Block Chaining operation mode; CFB - Cipher Feedback operation mode; OFB - Output Feedback operation mode.
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