Why in news
- India successfully demonstrated its first 5.56 km free-space Quantum Key Distribution link between BISAG-N and IIT Gandhinagar.
Key terms
Quantum Key Distribution
A secure communication method that uses quantum mechanics to exchange cryptographic keys.
Post-Quantum Cryptography
Cryptographic algorithms designed to remain secure against decryption by classical and quantum computers.
Quantum Bit Error Rate
The percentage of erroneous bits in a quantum channel used to detect eavesdropping attempts.
Free-Space Optics
Optical communication technology that transmits data wirelessly through air using light beams.
What is Quantum Key Distribution (QKD)?
- QKD uses quantum mechanics principles, such as photon superposition and entanglement, to exchange cryptographic keys securely.
- Any attempt by an eavesdropper to intercept the quantum channel irreversibly alters the quantum states, alerting the communicating parties.
Key details of the trial
- Achieved a stable Quantum Bit Error Rate below 5 percent with key generation rates between 230 and 260 bits per second.
- Integrated hardware-based QKD over free-space optical channels with software-based Post-Quantum Cryptography on the Vedic Kavach platform.
- Demonstrates the feasibility of secure point-to-point quantum links without relying on physical fiber infrastructure.
Why it matters
- Protects critical infrastructure and defence communications against future quantum computing decryption threats.
- Lays the technological foundation for satellite-based quantum communications across long distances.
Prelims facts
- QKD uses quantum principles to detect interception instantly during key exchange.
Mains discussion
- Enhancing strategic cyber defense through hybrid hardware-software quantum resilience.
Source: PIB Press Release
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