1) Key Free Trust in the Semantic Web http://www.w3.org/2002/03/key-free-trust.html
This document briefly introduces the topic of trusted semantic web applications that do not require the existence of an complex public key infrastructure.
2) The silicon Trust Online http://www.silicon-trust.com/background/sp_pki.htm
One problem is that if a hacker has knowledge of your private key information, they can intercept a message and replace the public key with one of his or her own. This is known as a
man-in-the-middle attack. {MITM}
*Biometric Security for PKI
*Thwarting man-in-the-middle attacks
*Weaknesses of PKI
*Biometric security
*For further reference:
Biometrics and PKI http://homepage.ntlworld.com/avanti/pki.htm
Information on "man-in-the-middle" attacks: http://www.incrypt.com/mitma.html