SSH (Secure Shell) is a cryptographic network protocol for secure data communication over unsecured networks. Here's a breakdown of its key features:

Core Components 🔐

  • Encryption: Uses AES, 3DES, or ChaCha20 for data confidentiality
  • Authentication: Supports password, public key (e.g., RSA, ECDSA), and two-factor methods
  • Port: Default port is 22 (modifiable for security)
  • Protocol Layers:
    • Transport Layer (🌐)
    • Authentication Layer (🔐)
    • Connection Layer (🔄)

Security Features 🛡️

  • Data Integrity: HMAC ensures message authenticity
  • Compression: Optional (e.g., zlib) for performance
  • Forwarding: Supports X11 and port forwarding for enhanced access

Best Practices 📚

  • Always use strong ciphers and disable weak algorithms
  • Regularly update SSH server configurations
  • Enable two-factor authentication for critical systems

For deeper insights into SSH security, check our guide on SSH Security Best Practices.

SSH_Protocol_Layer
SSH_Encryption_Methods
SSH_Authentication_Mechanisms
SSH_Session_Management