Technische Berichte
Arbeitsgruppe Johannes Buchmann
2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 | 1999 | 1998 | 1997 | 1996
Peer Rexroth, Alexander Wiesmaier
MAVA - Modular Security for
Distributed Applications
Technical Report No. TI-1/07, 22.07.2007
Johannes Buchmann
Passwörter oder Smartcards zur Absicherung von Portalen?
Technical Report No. TI-2/06, Oktober 2006
Alexander Wiesmaier
The State of the Art in Algorithmic Encryption
Technical Report No. TI-1/06, 02.01.2006
Erik Dahmen, Katsuyuki Okeya, Tsuyoshi Takagi
Efficient Left-to-Right Multi-Exponentiations
Technical Report No. TI-2/05, 01.11.2005
Ralf-Philipp Weinmann
3. Krypto-Tag - Workshop über Kryptographie (ps, pdf)
Technical Report No. TI-1/05, 15.09.2005
Katja Schmidt-Samoa, Olivier Semay, Tsuyoshi Takagi
Analysis of Some Efficient Window Methods and their Application to Elliptic Curve Cryptosystems
Technical Report No. TI-3/04, 16.08.2004
Katsuyuki Okeya, Tsuyoshi Takagi, Camille Vuillaume
On the Importance of Protecting ∆ in SFLASH
against Side Channel Attack (pdf, ps.gz)
Technical Report No.TI-8/04, 28.06.2004 (appeared at ITCC 2004)
Katja Schmidt-Samoa
Factorization-based Fail-Stop Signatures Revisited
Technical Report No. TI-7/04, 15.Juni 2004
ICICS 2004, LNCS 3269, pp.118-131, 2004
Harald Baier, Markus Ruppert
Interoperable and Flexible Digital Signatures for E-Government and E-Commerce
Technical Report No. TI-6/04, 13.05.2004
Tobias Straub, Harald Baier
A Framework for Evaluating the Usability and the Utility of PKI-enabled Applications
Technical Report No. TI-5/04, 13.05.2004
Hisayoshi Sato, Daniel Schepers, Tsuyoshi Takagi
Exact Analysis of Montgomery Multiplication (
pdf, ps.gz)
Technical Report No. TI-2/04, 12.05.2004
Arthur Schmidt, Ulrich Vollmer
Polynomial Time Quantum Algorithm for the Computation of the Unit Group of a Number Field
Technical Report No. TI-1/04, Mai 2004
Katja Schmidt-Samoa, Tsuyoshi Takagi
Kaoru Kurosawa
A Complete and Explicit Security Reduction Algorithm for RSA-based Cryptosystems (ps, pdf)
Technical Report No. TI-9/03, 15.12.2003
Asiacrypt 2003, LNCS 2894, pp.474-491, 2003
Kira Kastell, Ulrike Meyer, Rolf Jakoby
Secure Handover Procedures
Technical Report No. TI-8/03 (appeared at CIC 2003)
Harald Baier
A Fast Java Implementation of a Provably Secure Pseudo Random Bit Generator Based on the Elliptic Curve Discrete Logarithm Problem
Technical Report No. TI-7/03, 01.12.2003
Johannes Buchmann, Tsuyoshi Takagi
Kryptographie - Chancen und Risiken
Technical Report No. TI-6/03, 18.11.2003
Johannes Buchmann, Arthur Schmidt
Computing the structure of a finite abelian group
Technical Report No. TI-5/03, 12.06.2003
Harald Baier, Günter Köhler
How to Compute the Coefficients of the Elliptic Modular Function j(z)
Technical Report No. TI-4/03, 21.05.2003
Johannes Buchmann, Tsuyoshi Takagi, Ulrich Vollmer
Number field cryptography
Technical Report No. TI-11/03, 16.05.2003
Ulrich Vollmer
A Note on the Hermite Basis Computation of Large Integer Matrices
Technical Report No. TI-10/03, 23.04.2003
Christoph Ludwig
A Faster Lattice Reduction Method Using Quantum Search
Technical Report No. TI-3/03, 21.02.2003 (revised version published at ISAAC 2003)
Harald Baier, Johannes Buchmann, Christoph Busch
Aus- und Weiterbildung in IT-Sicherheit
Technical Report No. TI-2/03, 19.02.2003
Toru Akishita, Tsuyoshi Takagi
Zero-Value Point Attacks on Elliptic Curve Cryptosystem (ps,pdf)
Technical Report No. TI-1/03, 19.02.2003 (appeared at ISC 2003)
Dennis Kügler, Holger Vogt
Off-line Payments with Auditable Tracing
Technical Report No. TI-8/02
Christoph Ludwig
The Security and Efficiency of Micciancio's Cryptosystem
Technical Report No. TI-7/02
Birgit Henhapl
Platform Independant Elliptic Curve Cryptography over Fp
Technical Report No. TI-6/02
Bodo Möller
Provably Secure Public-Key Encryption for Length-Preserving Chaumian Mixes
Technical Report No. TI-5/02 (revised version to appear at CT-RSA 2003)
Markus Tak
Ein S/MIME-Plugin für Outlook zur Verwendung alternativer kryptographischer Algorithmen
Technical Report No. TI-9/02, 14. 05.2002
Kouichi Sakurai, Tsuyoshi Takagi
On the Security of a Modified Paillier Public-Key Primitive (ps), (pdf)
Technical Report No. TI-4/02, 22.04.2002 (appeared at ACISP 2002)
Tetsuya Izu, Tsuyoshi Takagi
On the Security of Brier-Joye's Addition Formula for Weierstrass-form Elliptic Curves (ps), (pdf)
Technical Report No. TI-3/02, 27.02.2002 (appeared at PKC 2003)
Ulrich Vollmer
An accelerated Buchmann algorithm for regulator computation in real quadratic fields (ps), (pdf)
Technical Report No. TI-2/02, 26.02.2002
Michael Hartmann, Sönke Maseberg
Fail-Safe-Konzept für Public-Key-Infrastrukturen
Technical Report No. TI-1/02, 30.01.2002
Dennis Kügler, Holger Vogt
Auditable Tracing with Unconditional Anonymity
Technical Report No TI-16/01
Dennis Kügler, Holger Vogt
Unsichtbare Markierungen in elektronischem Geld
Technical Report No TI-15/01
Dennis Kügler, Holger Vogt
Fair Tracing without Trustees
Technical Report No TI-14/01
Kouichi Sakurai, Tsuyoshi Takagi
New Semantically Secure Public-Key Cryptosystems from the RSA-Primitive
Technical Report No. TI-12/01, 14.11.2001 (appeared at PKC 2002)
Harald Baier
Elliptic Curves of Prime Order over Optimal Extension Fields for Use in Cryptography
Technical Report No. TI-11/01, 02.10.2001
Johannes Buchmann, Kouichi Sakurai, Tsuyoshi Takagi
An IND-CCA2 Public-Key Cryptosystem with Fast Decryption
Technical Report No. TI-10/01, 06.09.2001 (appeared at ICISC 2001)
Michael Hartmann, Sönke Maseberg
Smart Cards for the FlexiPKI Environment
Technical Report No. TI-9/01, 29.05.2001
Bodo Möller
Algorithms for multi-exponentiation
Technical Report No. TI-8/01, 27.04.2001
(revised version appeared at SAC 2001)
Harald Baier
Efficient Computation of Fourier Series and Singular Moduli with Application in
Cryptography
Technical Report No. TI-7/01, 19.04.2001
Markus Ernst, Birgit Henhapl
High Performance ECDSA over F(2^n) based on Java with Hardware Acceleration
Technical Report No. TI-6/01, 07.04.2001
Johannes Buchmann
Wie sicher kann Sicherheit sein?
Technical Report No. TI-5/01, 28.03.2001
Johannes Buchmann, Safuat Hamdy
A Survey on IQ Cryptography
Technical Report No. TI-4/01, 21.03.2001
Markus Ruppert, Markus Tak
Sicherheitsmanagement durch generische, objektorientierte
Modellierung einer TrustCenter Software
Technical Report No. TI-3/01, 20.03.2001
Harald Baier, Johannes Buchmann
Efficient Construction of Cryptographically Strong Elliptic Curves
Technical Report No. TI-2/01, 01.03.2001
Vlad Coroama, Markus Ruppert, Michael Seipel, Markus Tak
Java-basierte Kryptographie wird interoperabel
Technical Report No. TI-1/01, 20.02.2001
Michael Hartmann, Sönke Maseberg
Fail-Safe-Konzept für FlexiPKI
Technical Report No. TI-11/00, 14.12.2000
Dennis Kügler, Holger Vogt
Marking: A Privacy Protecting Approach against Blackmailing
Technical Report No. TI-9/00, 18.10.2000
Detlef Hühnlein
Faster Generation of NICE-Schnorr-type Signatures
Technical Report No. TI-8/00, 18.10.2000
Ulrich Vollmer
Asymptotically Fast Discrete Logarithms in Quadratic Number Fields
Technical Report No. TI-6/00, 19.06.2000
Johannes Buchmann, Markus Maurer, Bodo Möller
Cryptography Based on Number Fields with Large Regulator
Technical Report No. TI-5/00, 06.06.2000
Safuat Hamdy, Bodo Möller
Security of Crytosystems Based on Class Groups of Imaginary
Quadratic Orders
Technical Report No. TI-4/00, 29.05.2000 (revised version appeared at ASIACRYPT 2000)
Detlef Hühnlein
Quadratic orders for NESSIE - Overview and parameter sizes
of three public key families
Technical Report No. TI-3/00, 31.03.2000
Ingrid Biehl, Johannes Buchmann, Safuat Hamdy, Andreas Meyer
A Signature Scheme Based on the Intractability of Computing Roots
Technical Report No. TI-1/00, 22.02.2000 - updated: 15.06.2000
T. Hahn, A. Meyer, S. Neis, Th. Pfahler
Implementing Cryptographic Protocols Based on Algebraic Number Fields
Technical Report No. TI-24/99, 23.12.1999
Safuat Hamdy, Markus Maurer
Feige-Fiat-Shamir Identification Based on Real Quadratic Fields
Technical Report No. TI-23/99, 23.12.1999
Johannes Buchmann, Markus Ruppert, Markus Tak
FlexiPKI - Realisierung einer flexiblen Public-Key-Infrastruktur
Technical Report No. TI-22/99, 16.12.1999
Helo Appel, Ingrid Biehl, Arnulf Fuhrmann, Markus Ruppert, Tsuyoshi Takagi,
Akira Takura, Christian Valentin
Ein sicherer, robuster Zeitstempeldienst auf der Basis verteilter RSA-Signaturen
Technical Report No. TI-21/99, 16.12. 1999
Detlef Hühnlein
Elliptische Kurven in HBCI - ein Backup zu RSA
Technical Report No. TI-20/99, 30.11.1999
Detlef Hühnlein
A survey of crytosystems based on imaginary quadratic orders (extended abstract)
Technical Report No. TI-19/99, 30.11.1999
Detlef Hühnlein, Johannes Merkle
An efficient NICE-Schnorr-type signature
Technical Report No. TI-18/99, 17.10.1999
Detlef Hühnlein, Johannes Merkle
Secure and cost efficient electronic stamps
Technical Report No. TI-17/99, 28.09.1999
Ingrid Biehl, Johannes Buchmann, Safuat Hamdy, Andreas Meyer
Cryptographic Protocols Based on Intractability of Extracting Roots and
Computing Discrete Logarithms
Technical Report No. TI-16/99, 10.11.1999
Dennis Kügler, Markus Maurer
A Note on the Weakness of the Maurer-Yacobi Squaring Method
Technical Report No. TI-15/99, 18.10.1999
Thomas Liefke, Ohad Rodeh, Thomas Setz
First Steps in the Implementation of a Fault-Tolerant Tuple -
Space Machine for Volatile Data
Technical Report No. TI-13/99, 15.06.1999
Thomas Liefke, Thomas Setz
Extension of the TRIPS Prototype
Report about research carried out at the Hebrew University of Jerusalem, Israel
Technical Report No. TI-12/99, 15.06.1999
Michael Hartmann, Sachar Paulus, Tsuyoshi Takagi
NICE - New Ideal Coset Encryption -
Technical Report No. TI-11/99, 18.05.1999
Ingrid Biehl, Sachar Paulus, Tsuyoshi Takagi
Efficient Undeniable Signature Schemes based on Ideal Arithmetic in Quadratic Orders
Technical Report No. TI-10/99, 18.05.1999
Sachar Paulus, Tsuyoshi Takagi
A new public-key cryptosystem over quadratic orders with quadratic decryption time
Technical Report No. TI-9/99, 18.05.1999
Detlef Hühnlein, Tsuyoshi Takagi
Reducing logarithms in totally non-maximal imaginary quadratic orders to logarithms
in finite fields
Technical Report No. TI-8/99, 06.06.1999
Detlef Hühnlein, Andreas Meyer, Tsuyoshi Takagi
Rabin and RSA analogues based on non-maximal imaginary quadratic orders
Technical Report No. TI-7/99, 05.05.1999
Detlef Hühnlein
Efficient implementation of cryptosystems based on non-maximal
imaginary quadratic orders
Technical Report No. TI-6/99, 26.04.1999
Safuat Hamdy
Elliptische Kurven - Neue Wege in der Public-Key-Kryptographie
Technical Report No. TI-5/99, 23.04.1999
Johannes Buchmann, Douglas Squirrel
Kernels of Integer Matrices via Modular Arithmetic
Technical Report No. TI-4/99, 04.02.1999
Dennis Kügler, Markus Maurer, Sachar Paulus
Identitätsbasierte Kryptosysteme als Alternative zu Public Key Infrastrukturen
Technical Report No. TI-3/99, 02.02.1999
Johannes Buchmann, Markus Maurer
Wie sicher ist die Public-Key-Kryptographie?
Technical Report No. TI-2/99, 28.01.1999
Thorsten Knabe
LiPS basiertes Job Queueing System für LiDIA
Technical Report No. TI-1/99, 27.01.1999
Johannes Buchmann, Damian Weber
Discrete Logarithms: Recent Progress
Technical Report No. TI-12/98, 26.11.1998
Steven D. Galbraith, Sachar Paulus, Nigel P. Smart
Arithmetic on Superelliptic Curves
Technical Report No. TI-11/98, 12.10.1998
Thomas Setz
Dynamic-Load-Adaption in LiPS
Technical Report No. TI-10/98, 08.10.1998
Stefan Neis
Reducing Ideal Arithmetic to Linear Albebra Problems
Technical Report No. TI-9/98, 01.10.1998
Johannes Buchmann, Michael J. Jacobson, Stefan Neis, Patrick Theobald, Damian Weber
Sieving Methods for Class Group Computation
Technical Report No. TI-8/98, 01.10.1998
Edlyn Teske
The Pohlig-Hellman Method Generalized for Group Structure Computation
Technical Report No. TI-7/98, 11.08.1998
Johannes Buchmann, Markus Maurer
Approximate Evaluation of L(1,chi-delta)
Technical Report No. TI-6/98, 16.04.1998
Sachar Paulus, Tsuyoshi Takagi
A generalization of the Diffie-Hellman problem and related cryptosystems allowing
fast decryption
Technical Report No. TI-5/98, 16.02.1998
Sachar Paulus
Lattice Basis Reduction in Function Fields
Technical Report No. TI-2/98, 13.01.1998
Edlyn Teske
Speeding up Pollard's Rho Method for Computing Discrete Logarithms
Technical Report No. TI-1/98, 07.01.1998
Thomas Setz
Design, Implementation and Performance of a Mutex-Token based Fault-
Tolerant Tuple Space Machine
Technical Report No. TI-39/97, 20.11.1997
Patrick Theobald, Susanne Wetzel, Thomas Setz
LiDIA, LiPS - Erste gemeinsame Schritte
Technical Report No. TI-38/97, 25.11.1997
Thomas Liefke, Thomas Setz
Tupleview - ein Monitoring-, Debugging- und Profiling-Tool für LiPS
Technical Report No. TI-37/97, 25.11.1997
Thomas Setz, Jens Lippmann
Softwaretesten in LiPS
Technical Report No. TI-36/97, 25.11.1997
Marc Joye, Jean-Jacques Quisquater, Tsuyoshi Takagi
How to choose secret parameters for RSA-type cryptosystems over
elliptic curves
Technical Report No. TI-35/97, 25.11.1997
Sachar Paulus
MAJA - Das Konzept eines Multi Application JavaCard Environment
Technical Report No. TI-34/97, 25.11.1997
Markus Maurer
The logarithm function in LiDIA's bigfloat class
Technical Report No. TI-33/97, 19.11.1997
Detlef Hühnlein
Credential Management and Secure Single Login for SPKM
Technical Report No. TI-28/97, 17.11.1997
Sachar Paulus, Thomas Setz
Developing and Testing a Smart Card Application
Technical Report No. TI-27/97, 13.10.1997
Ingrid Biehl, Johannes Buchmann
An analysis of the reduction algorithms for binary quadratic forms
Technical Report No. TI-26/97, 07.11.1997
Volker Müller, Sachar Paulus
On the Generation of Cryptographically Strong Elliptic Curves
Technical Report No. TI-25/97, 10.10.1997
Detlef Hühnlein, Michael J. Jacobson, Jr., Sachar Paulus
A cryptosystem based on non-maximal imaginary quadratic orders with
fast decryption
Technical Report No. TI-24/97, 10.10.1997
Michael J. Jacobson, Jr.
Applying Sieving to the Computation of Quadratic Class Groups
Technical Report No. TI-19/97, 09.10.1997
Thomas Papanikolaou, Jörg Zayer
ALGO.STY - a LaTex style for algorithm editing
Technical Report No. TI-18/97, 08.10.1997
Thomas Papanikolaou
Technical documentation using a C++ to LaTex formatting program
Technical Report No. TI-17/97, 08.10.1997
Thomas Setz, Johannes Fischer, Thomas Liefke
libtracer: Eine komfortable Bibliothek zum
Generieren levelbasierter Tracing-Ausgaben
Technical Report No. TI-16/97, 12.08.1997
Thomas Setz
Experience with Literate Programming or
Towards Qualified Programming
Technical Report No. TI-15/97, 12.08.1997
Sachar Paulus, Hans-Georg Rück
Real and imaginary quadratic representations of hyperelliptic
function fields
Technical Report No. TI-14/97, 24.06.1997
Ralf Flassenberg, Sachar Paulus
Sieving in Function Fields
Technical Report No. TI-13/97, 10.06.1997
Ingrid Biehl, Susanne Wetzel
Traceable Visual Cryptography
Technical Report No. TI-10/97, 28.04.1997
Volker Müller
Efficient Algorithms for Multiplication on Elliptic Curves
Technical Report No. TI-9/97, 22.04.1997
Bruno Haible, Thomas Papanikolaou
Fast multiprecision evaluation of series of rational numbers
Technical Report No. TI-7/97, 18.03.1997
Thomas Setz, Thomas Liefke
The LiPS Runtime Systems
Technical Report No. TI-6/97, 11.02.1997
Johannes Buchmann, Sachar Paulus
A one way function based on ideal arithmetic in number fields
Technical Report No. TI-5/97
Volker Müller
Fast Multiplication on Elliptic Curves over Small Fields of
Characteristic Two
Technical Report No. TI-4/97, 27.01.1997
Edlyn Teske
A Space Efficient Algorithm for Group Structure Computation
Technical Report No. TI-3/97, 24.01.1997
Thilo E. Zieschang
On the Number of Cycles in Permutations
Technical Report No. TI-2/97, Januar 1997
Thilo E. Zieschang
Security Properties of Public Key Certification Networks
Technical Report No. TI-1/97, Januar 1997
Thilo E. Zieschang
Combinatorial Properties of Basic Encryption Operations
Technical Report No. TI-11/96, Dezember 1996
Thilo E. Zieschang
Breaking an Oblivious Transfer with Low Exponents
Technical Report No. TI-10/96, Dezember 1996
Klaus Kiefer
A New Fast and Secure Cryptosystem
Technical Report No. TI-8/96, 05.12.1996
Johannes Buchmann, Stefan Neis
Algorithms for Linear Algebra Problems over Principal Ideal Rings
Technical Report No. TI-7/96, 28.11.1996
Thomas Setz, Zohar Levy
Requirements for TRIPS
Technical Report No. TI-6/96, 07.11.1996
Johannes Buchmann, Friedrich Eisenbrand
On Factor Refinement in Number Fields
Technical Report No. TI-5/96,
Werner Backes, Patrick Theobald, Susanne Wetzel
Design Concepts for Matrices and Lattices in LiDIA
Technical Report No. TI-4/96, 02.10.1996
Thomas Setz, Johannes Fischer
Fault-tolerant Distributed Applications in LiPS
Technical Report No. TI-3/96, 17.07.1996
Johannes Buchmann, Michael Jacobson, Edlyn Teske
On some computational problems in finite abelian groups
Technical Report No. TI-2/96, 17.07.1996,
appear in Mathematics of Computation 1996
Ingrid Biehl, Bernd Meyer
Protocols for Collusion-Secure
Asymmetric Fingerprintig
Technical Report No. TI-1/96, 16.07.1996
