Network Security - Physical Layer Security (PHY Security)

This approach secures communication at the physical signal level, not just using encryption.

Key techniques

• Signal randomization

• Channel noise exploitation

• Beamforming in wireless systems

Why it is needed

• Encryption can be broken

• Wireless communication is easy to intercept

Use cases

• Wireless networks

• IoT devices

• Military and satellite communication

Example

Even if an attacker intercepts a signal, the physical properties of the channel prevent correct decoding.