Cipher Feedback Mode (CFB) is an encryption mode, that builds a self-synchronizing stream-cipher from a block-cipher.

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Known plaintext attack to CFB mode

How does a known plaintext attack on a block cipher in CFB mode work? I only see the following: If an attacker knows the plaintext $P_i$ he can recover the key $K_i = C_i \mathbin{\oplus} P_i$ from a ...