 # Introduction to Cryptography, Lecture 1

Flashcards by , created almost 4 years ago

## Flashcards on Introduction to Cryptography, Lecture 1, created by Jörg Schwartz on 01/18/2016. 2 0 0  Created by Jörg Schwartz almost 4 years ago
MODE, MEDIAN, MEAN, AND RANGE
CUMULATIVE FREQUENCY DIAGRAMS
Geometry Theorems
Circulatory System
GENERAL PRACTICE-1
Using GoConqr to teach Maths
FREQUENCY TABLES: MODE, MEDIAN AND MEAN
Using GoConqr to study Maths
Mathematics Overview
HISTOGRAMS
 Question Answer Define $\textit{plaintext}$$\textit{ciphertext}$ $$\textit{plaintext}$$ is the original message in readable form $$\textit{ciphertext}$$ is the encrypted message Method of cryptography Caesar employed? $$\textit{shiftcipher}$$, since every letter in the alphabet is shifted up or down Define $\textit{simple substitution cipher}$ A cipher in which each symbol is replaced by another symbol Convenient way to describe the encryption and decryption function of a simple substitution cipher Create a table by writing the plaintext resp. ciphertext alphabet in the top row and putting the ciphertext resp. plaintext letter below by correspondence How many simple substitution ciphers exist for the alphabet? $25!$ Define $\textit{key}$ for a simple substitution cipher The associated encryption table Define $\texit{cryptanalysis}$ The process of decrypting a message without knowing the underlying key Define $\textit{symmetric ciphers}$ Alice and Bob both share the knowledge of the secret key $$k$$