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77 what the purpose of this split is? Assume the key $K$ is shared |
77 what the purpose of this split is? Assume the key $K$ is shared |
78 only between the car and the transponder. Does the protocol |
78 only between the car and the transponder. Does the protocol |
79 achieve that the transponder $T$ authenticates itself to the car |
79 achieve that the transponder $T$ authenticates itself to the car |
80 $C$? Does the car authenticate itself to the transponder? |
80 $C$? Does the car authenticate itself to the transponder? |
81 |
81 |
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82 \item What are the main disadvantages of the following |
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83 protocol that establishes a mutual key between two |
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84 parties $A$ and $B$ with the help of a mutually trusted |
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85 third party $S$: |
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86 |
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87 \begin{center} |
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88 \begin{tabular}{l@{\hspace{2mm}}l} |
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89 $A \to S :$ & $A, B$\\ |
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90 $S \to A :$ & $\{K_{AB}\}_{K_{AS}}$ and $\{\{K_{AB}\}_{K_{BS}} \}_{K_{AS}}$\\ |
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91 $A \to B :$ & $\{K_{AB}\}_{K_{BS}}$\\ |
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92 $A \to B :$ & $\{m\}_{K_{AB}}$\\ |
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93 \end{tabular} |
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94 \end{center} |
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95 |
82 |
96 |
83 \item \POSTSCRIPT |
97 \item \POSTSCRIPT |
84 \end{enumerate} |
98 \end{enumerate} |
85 \end{document} |
99 \end{document} |
86 |
100 |