Key exchange is a method used by two devices to securely agree on a secret key for protecting their communication.

The key allows devices to encrypt and decrypt data. Key exchange is important because the devices need a secure way to establish this shared secret, even when communicating over the internet.

How It Works

• Two devices begin a secure connection.
• They exchange information using a key exchange method.
• Both devices calculate or establish the same secret key.
• The key is then used to protect the communication.
• The actual secret key does not need to be sent openly across the network.

Common Uses

• Setting up HTTPS connections.
• Establishing VPN connections.
• Securing wireless network communication.
• Protecting encrypted messaging.
• Creating secure connections between servers.

Related Terms: Encryption, Decryption, Cryptography, Public Key, Private Key, Asymmetric Encryption, Symmetric Encryption, Diffie-Hellman, TLS, VPN

Related Entries

• Cross-Site Scripting
• Asymmetric Encryption
• Asymmetric Encryption
• TLS
• Eavesdrop Protection