Lecture 09 - Cryptography

Question 1

Cryptography

Answer 1

process of hiding information so that only the person a message was intended for can read it

Question 2

Encryption

Answer 2

Scrambling data to be readable only by intended recipients

Question 3

Steganography

Answer 3

Hiding the existence of a message

Question 4

Cryptanalysis

Answer 4

Process of breaking cryptography

Question 5

Shift Cipher

Answer 5

Substitution cipher shifting letters by a fixed number

Question 6

One-Time Pad

Answer 6

Encrypting each letter uniquely with a random key

Question 7

Pseudo Random Number Generator

Answer 7

Algorithm that generates sequences of numbers that appear random but are determined by a fixed initial value.

Question 8

Stream Ciphers

Answer 8

Using pseudo-random generators for encryption

Question 9

Block Ciphers

Answer 9

Encrypt data in blocks

Question 10

Perfect Secrecy

Answer 10

no computational power can guess or obtain any information about the plain text or secret keys

Question 11

Cryptographic Hash Function

Answer 11

Maps messages to fixed-size output

Question 12

Data Encryption Standard (DES)

Answer 12

Encrypts Plaintext by breaking it down into smaller parts and using a cryptographic key to decrypt it

Question 13

Advanced Encryption Standard (AES)

Answer 13

widely used symmetric encryption algorithm for securing data online

Question 14

Message Authentication Code (MAC)

Answer 14

Short piece of information used for authenticating and integrity-checking a message

Question 15

RSA Algorithm

Answer 15

widely used asymmetric encryption algorithm for secure communication and digital signatures