what are NCFB and NOFB modes for?

StackOverflow https://stackoverflow.com/questions/4574245

  •  14-10-2019
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Question

I can't find it anywhere, when I google it it shows this question posted here. Given that situation I want to ask precisely: What this "n" before cfb and ofb means ?

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Solution

This is one reference to nCFB and nOFB that I could find:

Note that CFB and OFB in the rest of the document represent the "8bit CFB or OFB" mode. nOFB and nCFB modes represents a n-bit OFB/CFB mode, n is used to represent the algorithm's block size.

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nOFB: The Output-Feedback Mode (in nbit). n Is the size of the block of the algorithm. This is a synchronous stream cipher implemented from a block cipher. It is intended for use in noisy lines, because corrupted ciphertext blocks do not corrupt the plaintext blocks that follow. This mode operates in streams.

nCFB: The Cipher-Feedback Mode (in nbit). n Is the size of the block of the algorithm. This is a self synchronizing stream cipher implemented from a block cipher. This mode operates in streams.

http://mcrypt.hellug.gr/lib/mcrypt.3.html

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