Crypto 101
The basics of Cryptography
So, What is Crypto?
Study of techniques for secure communication!
So, What is Crypto?
Something used to convert a message to nonsense!
Example!
The simplest Example would be:
Ceaser Cipher!
The Ceaser Cipher!
converts: I LOVE YOU to
C FIPY SIO
When the Key is: 20
Okay, How does it work?
Each letter is shifted by the key!
To Get it Back
Just shift in opposite direction!
Cons!
One can sit all day and try all 26 combinations!
Types of Encryption
- Symmetric
- Assymetric
- Hybrid
Symmetric
Use same key for encryption and Decryption
Example: Ceaser Cipher!
Assymetric
It uses two different keys for encryption and decryption.
Which leads to:
Public Key Cryptography
Public Key Cryptography
Two Keys (A pair)
- Public Key
- Private Key
Public Key Cryptography
- People Encrypt With Your Public Key!
- You Decrypt that with your Private Key!
PGP
Pretty Good Privacy
PGP
is an Hybrid CryptoSystem.
So, GPG?
Is an free implementation of OpenPGP standard!