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Using PKI (Public Key Infrastructure) for Web authentication is overkill. The expense of setting it up and maintaining the architecture outweighs the cost of using already available two-factor authentication systems. Also, PKI isn't as widely used as traditional two-factor systems, such as one-time password (OTP) tokens and smart cards, therefore, scalability and interoperability could be an issue in the future as your needs grow.
If you're a financial institution, you most likely have to comply with the recent Federal Financial Institutions Examination Council's (FFIEC) guidance recommending the use of two-factor authentication for all Internet- or Web-based banking and multi-layered defenses as well. These defenses include fraud detection systems, which aren't true authentication systems, but can provide the same protection by blocking malicious access to systems. Unlike authentication systems that verify the user, these products watch for patterns of transactions and block suspicious activity that falls out of the user's normal patterns.
However, these systems, and their two-factor cousins, have advantages over PKI. They also have an established track record, are easier and cheaper to deploy and set up, and are more widely used than PKI.
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This was first published in May 2006
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