
Papers
Almost every vector valued modular form is an oldform, arXiv:1401.6214 [math.NT], 2014
Practical Algebraic Cryptanalysis for Dragonbased Cryptosystems, LNCS 6467. Presented at CANS 2010
Algebraic Attack on the MQQ Public Key Cryptosystem, LNCS 5888. Presented at CANS09
Algebraic Attack on HFE revisited, LNCS 5222, pages 215227  presented at ISC 2008, Talk [en]
Theses
Masters Thesis in Mathematics [en], title: Discriminant forms and Hecke operators
Bachelor Thesis in Mathematics [en]  On modular forms, title: Rings of modular forms
Bachelor Thesis in Computer Science [en]  On Multivariate public key cryptography, Gröbner Bases, HFE. Title: HFE  solved or saved?
Other activities
Art 103 from Gauss Disquisitiones Arithmeticae (english translation) states that an odd x mod 2^n (n > 2) is a square if and only if x is congruent to +1 modulo 8
A proof for the oddity formula. Here we prove the socalled oddity formula relating different pexcesses of matrices/lattices. pexcesses have been introduced by Conway.
SL2(Z) = <s,u  s^4=id, u^3=s^2 >. We show that SL2(Z) is the free group generated by s,u (where s=S, u=TS) modulo the relations s^4=id, u^3=s^2.
The Weil representation is a representation. We prove the welldefinedness of the Weil representation on the group ring of a discriminant form.
Jordanizing Discriminant Forms. We prove that every discriminant form possesses a Jordan splitting.
Seminar: Spektraltheorie stark stetiger Halbgruppen [german]
LaTeX Vorlage [german] LaTeX
LaTeX Vorlage (NEU) [german] LaTeX

