The key points from this module are:
Cryptography is the science of keeping data secure from unwanted and untrusted entities.
The main objectives of cryptography are:
Fundamental problems addressed by cryptography are:
Key agreement problem
Secure Communication problem
The two main types of cryptographic primitives are:
Symmetric key primitives
Asymmetric key primitives
The four most common types of attack models are:
Ciphertext-only attack (COA)
known-plaintext attack (KPA)
Chosen plaintext attack (CPA)
Chosen ciphertext attack (CCA)
Kerckhoffs' Principle states: A cryptosystem should be secure even if everything about the system, except the key is public knowledge.
The interpretation of Perfect Security suggests that the probability of knowing a plain-text remains the same before and after seeing the cipher-text
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