Link Encryption

A security method encrypting data at the communication link level to protect transmissions.

Understanding Link Encryption

Unlike end-to-end encryption, which protects data at the application layer, link encryption encrypts all traffic as it moves through intermediate nodes, such as routers and switches. Each device decrypts and re-encrypts the data before forwarding it to the next hop, ensuring that the entire communication path remains secure.

How Link Encryption Works

Encryption at the Source Node

Data is encrypted before transmission using cryptographic algorithms.
Only authorized devices along the communication path can decrypt and re-encrypt the data.

Decryption & Re-encryption at Each Network Node

Intermediate routers and switches decrypt the received data to process routing.
The data is then re-encrypted before being forwarded to the next node.

Decryption at the Destination Node

The final recipient decrypts the data for use.
Ensures secure transmission even if multiple network segments are involved.

Challenges and Considerations

Performance Impact on Network Devices: Encryption processing at each hop can affect speed.
Compatibility Issues: Legacy systems may not support modern encryption standards.
Key Distribution Complexity: Secure key exchange between network nodes is essential for preventing breaches.