Cryptography

Confidentiality

Can only be seen by intended people

Integrity

Received data isn't tempted with or altered

non-repudiation

Sender did send the data

Authentication

One's identity

Caesar

Letter + 3= letter

rot 13

Letter + 13 = letter

Vigenenere

Uses 26*26 a-z grid

Converts readable texts into a form which we cannot read

Needs key to convert it back to readable texts

Plaintext

Readable text

Ciphertext

Encrypted text

Cipher

Encryption algorithm/technique

Encryption

Plaintext->Ciphertext

Description

Ciphertext->Plaintext

Key

Whats used to turn Plaintext->Ciphertext

Key space

Number of possible keys that can be created
from an algorithm