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For a block cipher $E_k()$, consider the following process applied to a message $M$ of length $\ell$ blocks $M_0,\ldots,M_{\ell-1}$ $$X_0=0$$ $$Y_i=X_i\oplus M_i$$ $$X_{i+1}=E_k(Y_i).$$ In CBC encryption with 0 IV the ciphertext is the sequence $X_1,\ldots,X_{\ell}$ and in CFB encryption with IV $E^{-1}_k(0)$ the ciphertext is the sequence \$Y_0,\ldots, Y_{\...