entries: Jerschow2012a: type: InProceedings title: '{Secure Client Puzzles based on Random Beacons}' year: '2012' pages: '' month: May booktitle: 'IFIP Networking 2012: Proceedings of the 11th International Conference on Networking' location: Prague, Czech Republic author: - first: Yves middle: Igor last: Jerschow - first: Martin last: Mauve