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The entire operation of PGP is based on introducer trust, the certificate trust, and the legitimacy of the public keys Introducer Trust Levels With the lack of a central authority, it is obvious that the ring cannot be very large if every user in the PGP ring of users has to fully trust everyone else
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SECURITY IN THE INTERNET: IPSec, SSUFLS, PGP, VPN, AND FIREWALLS
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(Even in real life we cannot fully trust everyone that we know) To solve this problem, PGP allows different levels of trust The number of levels is mostly implementationdependent, but for simplicity, let us assign three levels of trust to any introducer: none, partial, and full The introducer trust level specifies the trust levels issued by the introducer for other people in the ring For example, Alice may fully trust Bob, partially trust Anne, and not trust John at alL There is no mechanism in PGP to determine how to make a decision about the trustworthiness of the introducer; it is up to the user to make this decision Certificate Trust Levels When Alice receives a certificate from an introducer, she stores the certificate under the name of the subject (certified entity) She assigns a level of trust to this certificate The certificate trust level is normally the same as the introducer trust level that issued the certificate Assume Alice fully trusts Bob, partially trusts Anne and Janette, and has no trust in John The following scenarios can happen 1 Bob issues two certificates, one for Linda (with public key K1) and one for Lesley (with public key K2) Alice stores the public key and certificate for Linda under Linda's name and assigns a full level of trust to this certificate Alice also stores the certificate and public key for Lesley under Lesley's name and assigns a full level of trust to this certificate 2 Anne issues a certificate for John (with public key K3) Alice stores this certificate and public key under John's name, but assigns a partial level for this certificate 3 Janette issues two certificates, one for John (with public key K3) and one for Lee (with public key K4) Alice stores John's certificate under his name and Lee's certificate under his name, each with a partial level of trust Note that John now has two certificates, one from Anne and one from Janette, each with a partial level of trust 4 John issues a certificate for Liz Alice can discard or keep this certificate with a signature trust of none Key Legitimacy The purpose of using introducer and certificate trusts is to determine the legitimacy of a public key Alice needs to know how legitimate are the public keys of Bob, John, Liz, Anne, and so on PGP defines a very clear procedure for determining key legitimacy The level of the key legitimacy for a user is the weighted trust l~vel of that user For example, suppose we assign the following weights to certificate trust levels: 1 A weight of 0 to a nontrusted certificate 2 A weight of ~ to a certificate with partial trust 3 A weight of 1 to a certificate with full trust Then to fully trust an entity, Alice needs one fully trusted certificate or two partially trusted certificates for that entity For example, Alice can use John's public key in the previous scenario because both Anne and Janette have issued a certificate for John, each with a certificate trust level of ! Note that the legitimacy of a public key belonging 2 to an entity does not have anything to do with the trust level of that person Although Bob can use John's public key to send a message to him, Alice cannot accept any certificate issued by John because, for Alice, John has a trust level of none
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