• Practice of techniques and study about secure communication
• Encryption - Scrambling data into a format that can only authorized individuals can understand
• Difference between Hashing and Encryption is that encrypted messages can be reversed and hashed messages cannot be decrypted to reveal original data.
• Converting plaintext to ciphertext

• Encryption requires a key, a mathematical values that sender and receiver must know.

• Logical, Predictable

• True Encryption is hard to brute-force

• Data encrypted as 'rest' when stored or 'in-transit' when being sent.

• An Encryption Algorithm - Mathematical algorithm that decides how data is turned into cipher text.

• A Cryptographic Key - is a string of characters in an encryption algorithm used to encrypt or decrypt data.

2 Types

Symmetric Encryption - Only one key. Uses the same key for encrypting and decrypting.

Asymmetric Encryption / Public Key Encryption - Two keys, one is private and the other one is shared publicly. Either key can encrypt or decrypt but the same key can't decrypt the message it encrypted.