Cipher Feedback Mode(CFB) | Algorithm Modes in Cryptography

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--------------------------------------------------------------------------------------------- In this network security video tutorial we will study and understand the working of Cipher Cipher Feedback (CFB) also known as CFB algorithm mode.
Cipher Feedback (CFB) -
1. In this mode data is encrypted in units that are smaller (e.g. they could be of size 8 bits) than a defined block size (which is usually 64 bits).
2. CFB mode works with j bits at a time (as we have seen, usually, but not always , j = 8)

Following are the steps of CFB mode -
Step 1 - Encrypt the IV(initialization vector) using the KEY to get the Encrypted IV.
Step 2 - Perform XOR operation between first j bits of encrypted IV and j bits of Plain Text to get j bits of Cipher Text(Cipher text block 1)
Step 3 - left shift the IV by j bits & add the cipher text block from the previous step to the right most side of the IV.

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