Security tokens underpin a number of operations that require access to an electronically restricted resource, for example, online banking, medical records, database of public administrations and large corporations. However, tokens that implement algorithms such as RSA (Rivest–Shamir–Adleman) are vulnerable to quantum computers and will ultimately become insecure. The goal of this project is to explore new types of security tokens for the quantum age, and compare them with existing technology. These tokens are being constructed using millimetre-scale chips that generate quantum states of light and link a Server and Client via entangled photons. Our vision is that quantum security tokens will find applications for securing the Internet of Things and self-driving cars, and will in the long run, be integrated into the quantum internet.
Image: Dr Caterina Vigliar working in the laboratory at the University of Bristol. Image credit: Dr Josh Silverstone