In cryptographic systems with hierarchical structure, a trust anchor is an authoritative entity for which trust is assumed and not derived. In X.509 architecture, a root certificate would be the trust anchor from which whole chain of trust is derived. The trust anchor must be in possession of the trusting party beforehand to make any further certi...
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http://en.wikipedia.org/wiki/Trust_anchor
A known good cryptographic certificate that can be used to validate a chain of trust. trust anchor repository (TAR) Any repository of public keys that can be used as trust anchors for validating chains of trust. See Interim Trust Anchor Repository (ITAR) for one such repository for top-level domain operators using DNSSEC.
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http://www.encyclo.co.uk/local/22073
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