What is cryptanalysis? What is differential cryptanalysis? What is linear cryptanalysis? What do cryptographic methods enable? Name four features or services. Where do the weaknesses in cryptosystems usually come from? Name three cryptographic operations. What are the two basic operations to encrypt information? What does the substitution operation entail? (when encrypting information) What does the transposition operation entail? (when encrypting information) Briefly discuss how cryptographic operations are characterized. What is a keyspace? What does work factor refer to? What unit do we use to state the size of a key in a keyspace? What is the recommendation (today) of key length for symmetric keys? What is the recommendation (today) of key length for RSA key lengths? What does the term diffusion refer to? What does the term confusion refer to? What does the term obfuscation refer to? What does perfect forward secrecy refer to? What do we mean when we say a system implements security through obscurity? Briefly define the term algorithm. What are the three typically used types of encryption algorithms? What is another name for symmetric key algorithms? Briefly describe how a shift cipher works. Briefly describe how the Vigenre cipher works. Briefly describe what key management entails.