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Cryptanalysis
Cryptanalysis
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–
An overview
An overview

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Unconditional Cryptography
Unconditional Cryptography
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Cryptographic schemes that are provably 100%
secure
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An opponent cannot break the scheme:
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even if unlimited text is available
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even if unlimited time is available
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even if unlimited computing power is available
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Strength of scheme relies on a mathematical proof
that the opponent does not have enough information
to break the cryptographic scheme

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Conditional Cryptography
Conditional Cryptography
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Cryptographic schemes that are not 100% secure
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An opponent can break the scheme:
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if unlimited text is available
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if unlimited time is available
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if unlimited computing power is available
•
Strength of such a scheme relies on the
assumption
that the opponent does not have sufficient resources
(text, time, computers, money) to break the scheme

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