509 certificates

Steelers4life
Steelers4life used Ask the Experts™
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I am doing a research project and having trouble finding the info. Where are all the places you can use a X.509 Certificate. I found the following so far .. HTTP , IMAP , FTP ,LDAP , EMAIL AND VPN. What other programs can use this standard?

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http://en.wikipedia.org/wiki/X.509#History_and_usage

It can be used in a peer-to-peer, OpenPGP-like web of trust[citation needed], but was rarely used that way as of 2004. The X.500 system has only ever been implemented by sovereign nations for state identity information sharing treaty fulfillment purposes, and the IETF's Public-Key Infrastructure (X.509), or PKIX, working group has adapted the standard to the more flexible organization of the Internet. In fact, the term X.509 certificate usually refers to the IETF's PKIX Certificate and CRL Profile of the X.509 v3 certificate standard, as specified in RFC 5280, commonly referred to as PKIX for Public Key Infrastructure (X.509).
http://download.oracle.com/javase/1.5.0/docs/guide/security/cert3.html#apps

What Applications use Certificates?
Probably the most widely visible application of X.509 certificates today is in web browsers (such as Netscape Navigator and Microsoft Internet Explorer) that support the SSL protocol. SSL (Secure Socket Layer) is a security protocol that provides privacy and authentication for your network traffic. These browsers can only use this protocol with web servers that support SSL.

Other technologies that rely on X.509 certificates include:

Various code-signing schemes, such as signed Java ARchives, and Microsoft Authenticode.
Various secure E-Mail standards, such as PEM and S/MIME.
E-Commerce protocols, such as SET.

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