Jochen Dittmann

Learn More
The content of this publication is the sole responsibility of the University Magdeburg and their co-authors and can in no way be taken to reflect the views of the European Union. Abstract In this paper we summarize our first research results in the field of Cross Culture user authentication. We will investigate intercultural aspects of biometrics, both of(More)
In this paper a new approach for combining biometric authentication and digital watermarking is presented. A digital audio watermark method is used to embed metadata into the reference data of biometric speaker recognition. Metadata in our context may consist of feature template representations complementary to the speech modality, such as iris codes or(More)
Contrary to cryptographic hash functions, which calculate the same value for only the same input, biometric hash functions have to generate identical hashes from varying input data of the same person. In this paper a secure sketch method is suggested that was developed to generate hash values from dynamic handwritten data. The presented secure sketch method(More)
It is shown that the connection form (gauge field) related to the generalization of the Berry phase to mixed states proposed by Uhlmann satisfies the source-free Yang-Mills equation * D * D ω = 0, where the Hodge operator is taken with respect to the Bures metric on the space of finite dimensional nondegenerate density matrices. 1 Connection form and Bures(More)
In this paper we visit annotation watermarking as a tool to embed information about a cover or parts thereof in the cover. We describe a framework for image annotation watermarking, especially Nested Object Annotation Watermarking. This was introduced in earlier works to embed not only textual and/or semantic descriptions as annotations but also their(More)
In this paper, we present an integrated research study in On-line Signature Verification undertaken by several teams that participate in the BioSecure Network of Excellence. This integrated work, started during the First BioSecure Residential Workshop, has as main objective the development of an On-line Signature Verification evaluation platform. As a first(More)
  • 1