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–Transforming text or data into cipher text that cannot be read by
unintended recipients

–Two methods for encryption on networks

- Two methods of encryption
1. Symmetric key encryption
• Sender and receiver use single, shared key
2.  Public key encryption
• Uses two, mathematically related
keys: public key and private key
• Sender encrypts message with recipient’s public key
• Recipient decrypts with private key

- Digital certificate : Data file used to establish the identity of users and electronic assets for protection of online transactions

- Public key infrastructure (PKI): Use of public key cryptography working with
certificate authority