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Additional info for ACM transactions on computer systems (February)
1, February 2005. • 46 P. Maniatis et al. We wish to establish that Cv (i, j ) ≥ Vv (i, j ) j −1 i−1 ⇔ [CMBF (k) + H(k)] + k=i k=1 CMBF (k) + VMBF (k) k=i+1 j −1 CMBF (k) ≥ k=1 j VMBF (k) + H(i) + k=1 j −1 ⇔ VMBF (k) k=i+1 i CMBF (k) ≥ k=i k=1 [VMBF (k) + H(k)] + k=1 j −1 i−1 ⇔ j i CMBF (k) ≥ VMBF (k) + VMBF ( j ) + H(i) k=1 j −1 ⇔ [CMBF (k) − VMBF (k)] ≥ VMBF ( j ) + H(i). (7) k=1 Intuitively, Inequality 7 captures the fact that the accrued premium that the voter pays round after round by computing effort proofs must “cover” the possible extra work that a poller performs to detect misbehavior.
Ticks split the value distributions into quartiles. Numbers above the distributions show the time in years needed by the adversary to cause maximum damage. The diagonal line shows the damage due to peer subversion. The horizontal line shows the threshold for irrecoverable damage. in Figures 3 and 5). 1 years. As subversion increases, the adversary is able to damage more loyal peers. With a 30% friend bias, the adversary does not cause irrecoverable damage with less than 36% initial subversion; beyond that level of subversion, he causes irrecoverable damage in no more than 13% of the runs in any particular subversion scenario (see the 30% friend bias curve of Figure 8).
1, February 2005. The LOCKSS Peer-to-Peer Digital Preservation System • 43 characteristics, especially its goal of preventing change, we nonetheless believe that the concepts and principles underlying the protocol will be useful in the design of other long-term large-scale applications operating in hostile environments. The LOCKSS project is hosted by SourceForge, where the current implementation can be obtained. The Narses simulator is also available from SourceForge. Both carry BSD-style Open Source licenses.