Lecture 8: Public Key Encryption, Hashing
El Gamal Padding
(True/False) The padding scheme presented only works if the message size is less than or equal to the number of plaintext bits
(True/False) Hybrid encryption works by using symmetric encryption to encrypt a message, and encrypting the symmetric key with asymmetric encryption.
El Gamal Security + Asynchronous Encryption
(True/False) El Gamal is secure if the Discrete Log problem holds
El Gamal Intuition
Which two cryptographic techniques/protocols is El Gamal built on?
Cryptographic Hash Functions
(True/False) Given a cryptographic hash function and some x, it is hard to find x' such that H(x) = H(x')
Hash Function Applications
(True/False) The application presented relies on the one-way property of a cryptographic hash function
Integrity and Authentication
(True/False) Encryption only gives you confidentiality but not integrity or authentication.
Message Authentication Codes (MACs)
(True/False) MACs ensure confidentiality and integrity
(True/False) AES-EMAC is a secure MAC even if the k1 and k2 are identical
(True/False) If the MAC is over the plaintext message instead of the encrypted message, the described scheme still provides confidentiality, integrity, and authentication.