ELEC 473 Cryptography Flashcards

Confidentiality

Ensure that information is only available to authorized user

Integrity

Ensure that information is altered in a reliable and appropriate manner

Availability

Ensure that information can be accesed by authorized users

Authenticity

Ensure that specified authorized users are who they say they are

Accountability

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

Passive Attacks

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

Active Attacks

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

Unconditional Security

A cryptosystem that cannot be broken even with INFINITE computational resources

Provable Security

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

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

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

Perfect Secrecy