Computer Network Security: Encryption Protocols

Encryption Protocols in Computer Network Security

Types of Encryption Protocols

• Symmetric Encryption Protocols:
  • Use the same key for encryption and decryption
  • Examples: AES (Advanced Encryption Standard), DES (Data Encryption Standard)
• Asymmetric Encryption Protocols:
  • Use a pair of keys: public key for encryption and private key for decryption
  • Examples: RSA (Rivest-Shamir-Adleman), Elliptic Curve Cryptography (ECC)

Secure Sockets Layer/Transport Layer Security (SSL/TLS)

• SSL (Secure Sockets Layer):
  • Developed by Netscape in 1994
  • Replaced by TLS in 1999
• TLS (Transport Layer Security):
  • Latest version: TLS 1.3 (2018)
  • Provides end-to-end encryption for web communications

Other Encryption Protocols

• IPSec (Internet Protocol Security):
  • Used for end-to-end encryption of IP packets
  • Supports both AH (Authentication Header) and ESP (Encapsulating Security Payload) protocols
• PGP (Pretty Good Privacy):
  • Used for encrypting email communications
  • Uses a combination of symmetric and asymmetric encryption
• SSH (Secure Shell):
  • Used for secure remote access to computers and networks
  • Supports encryption, authentication, and secure file transfer

Types of Encryption Protocols

• Symmetric Encryption Protocols use the same key for encryption and decryption, with examples including AES (Advanced Encryption Standard) and DES (Data Encryption Standard).
• Asymmetric Encryption Protocols use a pair of keys: a public key for encryption and a private key for decryption, with examples including RSA (Rivest-Shamir-Adleman) and Elliptic Curve Cryptography (ECC).

Secure Sockets Layer/Transport Layer Security (SSL/TLS)

History of SSL/TLS

• SSL (Secure Sockets Layer) was developed by Netscape in 1994.
• SSL was replaced by TLS in 1999.

Features of TLS

• The latest version of TLS is TLS 1.3, released in 2018.
• TLS provides end-to-end encryption for web communications.

Other Encryption Protocols

IPSec

• IPSec (Internet Protocol Security) is used for end-to-end encryption of IP packets.
• IPSec supports both AH (Authentication Header) and ESP (Encapsulating Security Payload) protocols.

PGP

• PGP (Pretty Good Privacy) is used for encrypting email communications.
• PGP uses a combination of symmetric and asymmetric encryption.

SSH

• SSH (Secure Shell) is used for secure remote access to computers and networks.
• SSH supports encryption, authentication, and secure file transfer.