ELEC 473 Cryptography Flashcards

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12 Terms

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Confidentiality

Ensure that information is only available to authorized user

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Integrity

Ensure that information is altered in a reliable and appropriate manner

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Availability

Ensure that information can be accesed by authorized users

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Authenticity

Ensure that specified authorized users are who they say they are

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Accountability

Ensure that users are responsible for their traces that they leave behind when using the internet

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Passive Attacks

Eavedrops, obtain message, and analyze the network traffice: frequency, length, identity, location, etc

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Active Attacks

Eavedrops and modify data stream or creation of false data stream
- Impersonation
- Replay
- Message Modification
- Denial of service

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Unconditional Security

A cryptosystem that cannot be broken even with INFINITE computational resources

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Provable Security

Reduce the security of the cryptosystem to some well-studied problems that is thoguth to be difficult

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Computational Security

  • The computational effort required to break a cryptosystem

  • Best algo for breaking a system requires atleast N operations, where N is a very large number

  • No known practical cryptosystem can be proved to be secure under this definition

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One-Time Pad

Unconditional Security because it uses a random key with the same length as the plain text with no repetitions but is not practical

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Perfect Secrecy

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