- Cryptography is a practice of creating and using encryption system
- Cryptographic system is a method of hiding data so that only certain people can view
- Plain text is the original data
- Ciphertext is the protected data or the encrypted text
- Encryption is the process or procedure to convert plain text to ciphertext
- Decryption is the procedure of converting ciphertext to plain text
- Cryptographic system consist of algorithm + key + key management facilities
2 basic type of cryptographic system
Symmetric
- Have only one key – private key
- use the same key to encrypt and decrypt
Asymmetric
- Have 2 key
- Public and private
