Abstract
Workflows with Segregation-of-Duty requirements or involving multiple parties with non-aligned interests (typically mutually distrustful) pose interesting challenges in often neglected security dimensions. Cryptographic approaches are presented to technically enforce strict auditability, traceability and multi-partyauthorized access control, and thus also enable exoneration from allegations. These ideas are illustrated by challenging examples - constructing various checks and balances for Telecommunications data retention, a vividly discussed and widely known issue. This article appears in the special edition „In Depth Security – Proceedings of the DeepSec Conferences Vol. 2“. Edited by Stefan Schumacher and René Pfeiffer
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