It is used to protect the digital data.It is a division of computer science that focuses on transforming data into formats that cannot be recognized by unauthorized users. The Two major technique in cryptography is Encryption and Decryption.
Example: Encrputed Message in which letters are replaced with other characters
Types
- Secret key
- Public Key
- Hash function
Five applications
- Authentication
- Time Stamping
- electronic money
- secure network
- Communicattions
- Anonymous remailers
- Disk Encryption
