DRDO’s Quantum Key Distribution (QKD) Platform

Prelims: Current events of national and international importance | Defence

Why in News?

The DRDO has successfully configured and tested a QKD platform on the live network at the Proof and Experimental Establishment (PXE) in Chandipur.

Quantum Key Distribution (QKD)

QKD – It is a secure communication protocol that leverages quantum mechanics to generate and distribute a shared secret cryptographic key between two parties.
This cryptographic key can then be employed to encrypt and decrypt messages.
The protocol allows communicating parties to detect any attempts to intercept the quantum key, provided the protocol's security assumptions hold.
Aim – To secure real-time critical observations and telemetry during artillery and armoured weapon testing.

Types of QKD Communication
Fibre-based QKD	Uses optical fibres to transmit quantum signals
Free-space QKD	Uses light through an open-air optical path; can avoid laying dedicated optical fibres

Importance of Free-Space QKD
Free-space QKD reduces the reliance on installing optical fiber infrastructure.
This approach is particularly advantageous in challenging terrains and densely populated urban environments.
It may also minimize infrastructure disruption and lower deployment costs in appropriate scenarios.
However, free-space QKD requires appropriate optical links and unobstructed line-of-sight conditions, limiting its applicability in certain environments.
Advantages and Limitations

Advantages	Limitations / Considerations
Enables detection of interception attempts	Requires specialised quantum hardware
Supports secure cryptographic key distribution	Practical range and channel losses can be limiting
Useful for sensitive strategic communications	Deployment and maintenance can be expensive
Can complement existing encryption systems	Does not automatically secure compromised endpoints or the entire network

Applications
- Defence – It can secure telemetry, weapon-test observations, and strategic communications.
- Finance – It enables the protection of sensitive financial data transmissions.
- Telecommunications – It enhances the security of selected communication networks.
- National security – It protects critical information infrastructure.

Reference

TOI | DRDO’s Quantum Key Distribution (QKD) Platform