Subtopic Notes
2.3 Encryption
2. Data transmission
- Encryption is the process of converting data into an unreadable form to prevent unauthorized access.
- Plaintext: Original text
- Ciphertext: Encrypted Text
- Public key: Publicly available key that is used to encrypt message
- Private Key: Key only known to owner used to decrypt data encrypted with corresponding public key
- Symmetric Encryption:
- Same key is used for both encrypting and decrypting
- Key must be shared securely in advance
- Asymmetric Encryption:
- Uses a public key and a private key
- The sender encrypts the message with the receiver’s public key
- Data is decrypted using the private key