Beta 1

Title Key Management in Cryptographic Access Control
Author Thyregod, Simon
Supervisor Jensen, Christian D. (Department of Informatics and Mathematical Modeling, Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark)
Institution Technical University of Denmark, DTU, DK-2800 Kgs. Lyngby, Denmark
Thesis level Master's thesis
Year 2006
Abstract This thesis project is a part of the CryptoOS project, where cryptographic access control methods are used to replace traditional access control mechanisms. This provides a truly decentralised design, where access is not related to users, but to the possession of cryptographic keys. By using a combination of symmetric and asymmetric encryption it is possible to differentiate access to three levels: Full-, read- and ”integrity check” authorisation. The ”integrity check” authorisation provides the possibility to verify the integrity of data, without knowing its actual contents. This makes it possible to store confidential data on less trustworthy file servers, which only can verify the integrity of the data, and not learn its contents. Each file has a key, which is used to gain access to the file. These keys are collected in key rings, which provide the possibility to form different access control models. To handle the key rings and demonstrate the proposed design a key managing application and different types of servers has been implemented and evaluated. The implementation proofs that it is possible to use cryptographic access control to replace existing access control mechanisms. The performance is a bit slower than traditional models, but the overall security is increased and the design is completely decentralised and scalable, which usually requires a lot more computations.
Imprint Department of Informatics and Mathematical Modeling, Technical University of Denmark, DTU : DK-2800 Kgs. Lyngby, Denmark
Pages 111
Keywords Cryptography; Key Management; Cryptographic Access Control,|Distributed Systems; CryptOS; Cryptographic Key Rings; Distribution of Cryptographic|Keys.
Original PDF imm4447.pdf (2.78 MB)
Admin Creation date: 2006-10-06    Update date: 2012-12-18    Source: dtu    ID: 191672    Original MXD