2026-07-072026-07-07http://salesiana.dossiersoluciones.com/handle/123456789/32177In peer-to-peer systems, attrition attacks include both traditional, network-level denial of service attacks as well as application-level attacks in which malign peers conspire to waste loyal peers' resources. We describe several defenses for LOCKSS, a peer-to-peer digital preservation system, that help ensure that application-level attacks even from powerful adversaries are less effective than simple network-level attacks, and that network-level attacks must be intense, wide-spread, and prolonged to impair the system.14 pages, 8 figures. version 2: Reworked the paper according to reviews. Expanded the evaluation section with experiments with more AUsCryptography and SecurityC.2.4; D.4.6text