Solving NTRU Challenges Using the New Progressive BKZ Library

Research output: ThesisMaster's Thesis

307 Downloads (Pure)


NTRU is a public-key cryptosystem, where the underlying mathematical problem is currently safe against large-scale quantum computer attacks. The system is not as well investigated, as for example RSA, and the company behind NTRU has created the NTRU Challenges, to remedy this. These challenges consist of 27 different public keys of increasing size, where the task in each challenge is to calculate (something similar to) the private key. The goal of this thesis was to examine different attacks against the NTRU Challenges and solve as many challenges as possible. By lattice reduction attacks, using a recently published new progressive BKZ algorithm, the first five challenges were solved, while the current biggest solved challenge by any researcher is challenge number seven.
Original languageEnglish
Awarding Institution
  • Department of Electrical and Information Technology
  • Johansson, Thomas, Supervisor
  • Guo, Qian, Supervisor
Publication statusPublished - 2016

Subject classification (UKÄ)

  • Other Electrical Engineering, Electronic Engineering, Information Engineering

Free keywords

  • NTRU Challenge
  • Progressive BKZ
  • BDD
  • Enumeration
  • SVP


Dive into the research topics of 'Solving NTRU Challenges Using the New Progressive BKZ Library'. Together they form a unique fingerprint.

Cite this