Cryptography

Preprint on Ideal Lattices, Class Groups and Parameter Security for Ring-LWE

We critically examine standard power-of-two RLWE parameter choices and propose prime cyclotomic fields as alternative parameter rings.

Seminar Talk on Ring-LWE, Ideal Lattices and Class Numbers

We study the growth of class numbers and discuss different parameter choices for Ring Learning with Errors (RWLE) that can influence the hardness of the underlying approximate shortest vector problem.

A Course in Cryptography

Neues Buch über Kryptographie mit den wichtigsten modernen Verfahren und einem Ausblick auf die Post-Quantum Kryptographie.