Cryptography Basics

In cryptanalysis ,the study of the frequency of letters or groups of letters in a ciphertext. .s based on the fact that, in any given stretch of written language, certain letters and combinations of letters occur with varying frequencies.

• brute force

• CRIBS

• frequency analysis

• Morse Code

a method of encrypting alphabetic text by using a series of interwoven Caesar ciphers, based on the letters of a keyword. It employs a form of polyalphabetic substitution.

• Caesar cipher

• Vignere

• Key

• brute force

the art of writing or solving codes.

• decipher

• brute force

• key

• cryptography

to decode or decipher.

• cipher

• enigma machine

• brute force

• decrypt

How many letters are in the alphabet?

• 20

• 26

• 27

a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet. For example, with a left shift of 3, D would be replaced by A, E would become B, and so on. The method is named after Julius Caesar, who used it in his private correspondence.^[1]

• Vigenere

• Caesar Cipher

• CRIBS

• cryptography

In cryptography, an attacker submitting many passwords or passphrases with the hope of eventually guessing a combination

• Turing

• decrypt

• brute force

• key

a secret or disguised way of writing; a code.

• cipher

• decrypt

• Vigenere

To encrypt a message you need 2 main parts, a _________ & a key

• cipher

• code

• algorithm

• crypt

convert (a text written in code, or a coded signal) into normal , plaintext language.

• encrypt

• decipher

• frequency analysis

• brute force