| Guidelines |
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| • | Cryptography
is always based on algorithms |
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| which
are orders of magnitude easier to |
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| compute
in the forward (normal) direction |
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| than
in the reverse (attack) direction. |
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| • | The
attacker’s problem is never harder than |
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| trying
all possible keys |
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| • | The
more material the attacker has the |
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| easier
his task |
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