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116 Network Security Illustrated Now imagine if these identifications lacked photographs of the bearer Possession of the ID would be the only important factor in proving identity If somebody else got hold of your ID, he or she could easily pretend to be you This is the way many forms of identity used to exist Years ago, driver s licenses did not contain photographs, but after many incidences of fraud and misconduct, photographs were added to improve security The virtual equivalent to a pictureless ID is the digital certificate It contains personal data that can be used to identify the holder It is issued by a trusted organization, which makes the certificate itself trustworthy It is assumed that part of the certificate is kept confidential and can only be presented by the legitimate owner In the Security Considerations section, we ll look at this assumption a bit more carefully For now, pretend that the assumption is valid A complete digital certificate system includes people trying to prove their identity, people trying to verify their identity, and one or more trusted third parties capable of performing the verification as well The entire system is often referred to as a public key infrastructure (PKI) The term public does not mean the entire system is designed for public access Instead it refers to the underlying encryption system that uses a combination of freely shared (public) keys and secret (private) keys Two common types of digital certificates exist: Pretty Good Privacy (PGP) certificates and X509 certificates Both contain personal information about the bearer Both contain a public key used for verifying and decoding information The major difference between the two relates to the nature of the trusted third party that verifies the certificate Pretty Good Privacy is a popular system for digitally signing and encrypting documents The Gnu Privacy Guard (GPG) is a free, open-source version of PGP (which was originally open source but went through some strange legal issues) PGP establishes trust through an orgy of certificate swapping and signing As people get to know and trust one another, they sign each other s certificates The number of signatures and the trustworthiness of the people who sign determine a certificate s overall level of trust Well-known community members have the most heavily signed and highly trusted certificates Getting one of these big cheeses to sign a certificate automatically imparts a great deal of trust and establishes a stronger case for the certificate bearer s identity X509 certificates rely on a trustworthy central certificate authority that can validate the authenticity of a digital certificate This missionary-style approach to certification has the advantage of convenience: Only one organization needs to verify your certificate before it becomes trustworthy Obviously, this puts a great deal of responsibility on the shoulders of the certificate-signing authority They have to prove their trustworthiness to the community or else their certificates are valueless Verisign is the most prominent Certificate Authority as they validate the certificates used on most e-commerce Web sites X509 and PGP-style certificates have advantages and disadvantages when compared to one another X509 certificates can be transparent to an end user and are therefore used heavily in e-commerce Web sites and applications PGP certificates.

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Applications signed with a certificate, or chaining to a certificate, in this store run at the Privileged level Only highly trusted applications should have certificates in this store Applications signed with a certificate, or chaining to a certificate, in this store run at the Normal privilege level on two-tier devices and at the Privileged level on one-tier devices Most signed applications developed for Windows Mobile have certificates in this store Only used by the installer to determine the trust level of CAB or Cabinet Provisioning Files (CPFs) The installer checks this store when verifying installer files to determine at what privilege level the installation should run A special attribute in the certificate indicates the target privilege level This store exists so that an installation can run at the Privileged level, while the application itself will run at the Normal privilege level In general, all of the roots in the Normal or Privileged stores also exist within this store

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