A group of researchers has revealed what it says is a vulnerability in a specific implementation ofCRYSTALS-Kyber, one of the encryption algorithms chosen by the U.S. government as quantum-resistant last year. The exploit relates to “side-channel attacks on up to the fifth-order masked implementations of CRYSTALS-Kyber in ARM Cortex-M4 CPU,” Elena Dubrova, Kalle Ngo, and Joel Grtner of KTH