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(2005 / vol.8 / no.1)
Privacy-Enhanced Public-Key Certificate]{Privacy-Enhanced Public-Key Certificate: How to Embed an Individual's Sensitive Information into a Certificate
Seungjoo Kim, Dongho Won
Pages. 21-28     



When a Certification Authority (CA) issues X.509 public-key certificate
to bind a public key to a user,
the user is specified through one or more subject names
in the ``subject" field and the ``subjectAltName" extension field
of a certificate.
The ``subject" field or the ``subjectAltName" extension field
may contain a hierarchically structured distinguished name,
an electronic mail address, IP address,
or other name forms that correspond to the subject.
In this paper, we propose the methods
to protect the user's privacy information
contained in the ``subject" field or the ``subjectAltName" extension field
of a public-key certificate.



1. Introduction
2. Privacy requirements
3. Related works and analysis
4. Our proposed privacy-enhanced public-key certificate formats
5. Analysis
6. Conclusion



PKI, Public-key certificate, Privacy