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NUC970 Technical Reference Manual
Publication Release Date: Dec. 15, 2015
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Revision V1.30
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Figure 5.27-4 Cipher Block Chaining Mode
Cipher Feedback Mode (CFB):
The Cipher Feedback (CFB) mode is a confidentiality mode that features the feedback of successive
ciphertext segments into the input blocks of the forward cipher to generate output blocks that are
exclusive-ORed with the plaintext to produce the ciphertext, and vice versa. The CFB mode requires
an IV as the initial input block. The IV need not be secret, but it must be unpredictable.