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+\documentclass{article}
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+\usepackage[pdftex,active,tightpage]{preview}
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+
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+\usepackage{tikz}
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+\usetikzlibrary{calc}
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+
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+\begin{document}
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+\begin{preview}
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+% thanks to http://tex.stackexchange.com/a/75838/5645
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+\tikzset{XOR/.style={fill=black!15,draw,minimum size=13pt,circle,append after command={
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+ [shorten >=\pgflinewidth, shorten <=\pgflinewidth,]
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+ (\tikzlastnode.north) edge (\tikzlastnode.south)
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+ (\tikzlastnode.east) edge (\tikzlastnode.west)
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+ }
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+ }
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+}
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+
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+\tikzstyle{encrypt}=[draw,fill=black!15,rectangle,minimum size=20pt,inner sep=0pt]
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+\begin{tikzpicture}
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+ \newcommand{\n}{3}
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+ \foreach \nr in {1, ..., \n}{
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+ \node (M\nr) at (0,{(\n-\nr)*3}) {$C_\nr$};
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+ \node (x\nr)[XOR] at (2,{(\n-\nr)*3}) {};
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+ \node (E\nr)[encrypt] at (2,{(\n-\nr)*3+1}) {$E$};
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+ \node (K\nr) at (2,{(\n-\nr)*3+2}) {$K$};
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+ \node (C\nr) at (4,{(\n-\nr)*3}) {$M_\nr$};
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+
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+ \draw[->,very thick] (M\nr) -- (x\nr);
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+ \draw[->,very thick] (x\nr) -- (C\nr);
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+ \draw[->,very thick] (K\nr) -- (E\nr);
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+ \draw[->,very thick] (E\nr) -- (x\nr);
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+ }
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+
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+ \foreach \nr in {2, ..., \n}{
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+ \pgfmathtruncatemacro{\tmp}{\nr-1}
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+ \draw[->,very thick] (2, {(\n-\tmp)*3+0.5}) -- (1, {(\n-\tmp)*3+0.5}) -- (1, {(\n-\nr)*3+1}) -- (E\nr);
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+ }
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+
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+ \node (IV) at (0.5,{\n*3-2}) {$IV$};
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+ \draw[->, very thick] (IV) -- (E1);
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+
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+ \node (Mx) at (0,-1) {$\vdots$};
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+ \node (xx) at (2,-1) {$\vdots$};
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+ \node (Ex) at (4,-1) {$\vdots$};
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+\end{tikzpicture}
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+\end{preview}
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+\end{document}
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