ONE of three cryptography algorithms vying to become a global standard against the looming security threat posed by quantum computers has been cracked in a weekend using a standard laptop. The algorithm is now widely believed to be unfit for purpose.

A range of algorithms for encryption – the process of bundling data up into impenetrable files for safe transmission – are currently verified and approved as secure by the US National Institute of Standards and Technology (NIST), and consequently they are used around the …