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- Arthur Schmidt, Ulrich Vollmer
- STOC
- 2005

We present a quantum algorithm for the computation of the irrational period lattice of a function on Zn which is periodic in a relaxed sense. This algorithm is applied to compute the unit group ofâ€¦ (More)

- Ulrich Vollmer
- ANTS
- 2000

This article presents algorithms for computing discrete logarithms in class groups of quadratic number elds. In the case of imaginary quadratic elds, the algorithm is based on methods applied byâ€¦ (More)

- Ulrich Vollmer
- ISSAC
- 2003

A new algorithm is given and analyzed for the computation of the Hermite basis of a large integer matrix whose HNF has small essential part. The algorithm improves the results from [3] by droppingâ€¦ (More)

- Yanhui Xu, Nejila Parspour, Ulrich Vollmer
- 2012 XXth International Conference on Electricalâ€¦
- 2012

The tolerances and limitations in design and manufacturing of both motors and inverters lead to parasitic resistances in the phases. Therefore, the phase resistances are asymmetric, which causes anâ€¦ (More)

- Yanhui Xu, Nejila Parspour, Ulrich Vollmer
- IEEE Transactions on Industrial Electronics
- 2014

The tolerances and limitations in design and manufacturing of both electrical motors and inverters lead to parasitic resistances in the phases. Therefore, the phase resistances are asymmetric, whichâ€¦ (More)

- Johannes A. Buchmann, Alexander May, Ulrich Vollmer
- Commun. ACM
- 2006

Cryptographic long-term security is needed, but difficult to achieve. Use flexible cryptographic tools, and have replacements ready.

- Ulrich Vollmer
- ANTS
- 2002

We present a probabilistic algorithm for computing the regulator R of a real quadratic order of discriminant âˆ† running in time L( 1 2 , 3/ âˆš 8 + o(1)).

- Ulrich Vollmer
- 2003

The purpose of this thesis is to study the complexity of the discrete logarithm problem (DLP) and related problems in quadratic orders. The significance of these problems stems in large part fromâ€¦ (More)

- Marco Roetzer, Ulrich Vollmer, Ralph Kennel
- 2016 IEEE Industry Applications Society Annualâ€¦
- 2016

This paper describes a demodulation approach based on the least squares method for a saliency based position estimation in slowly sampled field-oriented control systems. The proposed approach focusesâ€¦ (More)

This paper gives an overview of the state of art in cryptography based on quadratic orders. It discusses the intractable problems in class groups and the infrastructure of quadratic orders,â€¦ (More)