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(Public Key Infrastructure) Electronic framework for trusted security. Participants in a PKI each obtain a digital certificate from a trusted Certificate Authority (CA), which then authenticates their identity when initiating a secure transaction. Individual transactions are encrypted by each participant using their own pair of electronic keys, one of which they keep for their own private use, while the other -- the 'public key' -- is made available to other participants. PKI has been widely adopted as the basis for secure Internet and web services transactions.

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Useful Web resources:

PKI Forum
Information resource and advocacy group run by e-business standards body OASIS.

Public-Key Infrastructure (X.509) (pkix)
Home page of PKIX, the IETF working group for Internet PKI based on industry-standard X.509 certificates.


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