MOD 11 QUIZ - Cryptography Flashcards
What is Cryptology?
Cryptography plus cryptoanalysis
What are Block Ciphers?
Operate on chunks of a message
After encryption has been applied, what is the message called?
Ciphertext
What are crypto variables also called?
Keys
What are Stream Ciphers?
Operate one bit at a time
When a message has not been encrypted, what is it called?
Plaintext
What are Message Digests?
Summaries of a message’s content produced by a hashing algorithm
Codes work on ________, ciphers work on ___________.
phrases, individual characters
What do Symmetric Key Algorithms rely on?
A shared secret
What is the term used to describe when a single change in the plaintext causes multiple changes spread throughout the ciphertext?
Diffusion
What is the primary weakness for Symmetric Key Algorithms?
Key distribution
What is a Nonce?
A random number
What is the principle that states, “A cryptographic system should be secure even if everything about the system, except the key, is public knowledge.”
Kerckhoff’s
What makes One-Time Pads so powerful?
They use a different substitution alphabet for each letter
What is the bit size for a cryptographic algorithm?
Number of bits in each key
