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Trust in Crowds: probabilistic behaviour in anonymity protocols

Trust in Crowds: probabilistic behaviour in anonymity protocols
Trust in Crowds: probabilistic behaviour in anonymity protocols
The existing analysis of the Crowds anonymity protocol assumes that a participating member is either ‘honest’ or ‘corrupted’. This paper generalises this analysis so that each member is assumed to maliciously disclose the identity of other nodes with a probability determined by her vulnerability to corruption. Within this model, the trust in a principal is defined to be the probability that she behaves honestly. We investigate the effect of such a probabilistic behaviour on the anonymity of the principals participating in the protocol, and formulate the necessary conditions to achieve ‘probable innocence’. Using these conditions, we propose a generalised Crowds-Trust protocol which uses trust information to achieves ‘probable innocence’ for principals exhibiting probabilistic behaviour.
88-102
Sassone, Vladimiro
df7d3c83-2aa0-4571-be94-9473b07b03e7
El-Salamouny, Ehab
64e904ef-e94d-4fa4-80a2-d363df48a23e
Hamadou, Sardaouna
a3681473-229f-423a-8113-b466cd1b5e98
Sassone, Vladimiro
df7d3c83-2aa0-4571-be94-9473b07b03e7
El-Salamouny, Ehab
64e904ef-e94d-4fa4-80a2-d363df48a23e
Hamadou, Sardaouna
a3681473-229f-423a-8113-b466cd1b5e98

Sassone, Vladimiro, El-Salamouny, Ehab and Hamadou, Sardaouna (2010) Trust in Crowds: probabilistic behaviour in anonymity protocols. Symposium on Trustworthy Global Computing, TGC 2010, Lecture Notes in Computer Science 6084. pp. 88-102 .

Record type: Conference or Workshop Item (Paper)

Abstract

The existing analysis of the Crowds anonymity protocol assumes that a participating member is either ‘honest’ or ‘corrupted’. This paper generalises this analysis so that each member is assumed to maliciously disclose the identity of other nodes with a probability determined by her vulnerability to corruption. Within this model, the trust in a principal is defined to be the probability that she behaves honestly. We investigate the effect of such a probabilistic behaviour on the anonymity of the principals participating in the protocol, and formulate the necessary conditions to achieve ‘probable innocence’. Using these conditions, we propose a generalised Crowds-Trust protocol which uses trust information to achieves ‘probable innocence’ for principals exhibiting probabilistic behaviour.

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Published date: April 2010
Venue - Dates: Symposium on Trustworthy Global Computing, TGC 2010, Lecture Notes in Computer Science 6084, 2010-04-01
Organisations: Web & Internet Science

Identifiers

Local EPrints ID: 268594
URI: http://eprints.soton.ac.uk/id/eprint/268594
PURE UUID: a561a106-86e9-4a12-ada3-e085aac6b76c

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Date deposited: 12 Mar 2010 11:28
Last modified: 04 Nov 2019 20:45

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