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Usability of the UK e-Science Certification Authority

The e-Science Certification Authority (CA) is a crucial component in the activities of the e-Science community. As one of the largest Grid CAs in the world, we have gained considerable experience with technical and operational issues. However, there are usability issues, some of which are inherent in a Public Key Infrastructure (PKI), others due to the level of assurance the CA must provide to be internationally accepted, others again for various technical reasons. The purpose of this paper is to discuss the most important usability issues, the steps we have taken to alleviate them, as well as the steps we plan to take in the future.