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The Three Laws of Data Encryption

Rich December 21, 2006 7 Comments

Lately (as in, most of the year) I’ve been seeing a lot of chatter around encryption- driven primarily by PCI and concerns about landing on the front page of every major newspaper in the . It cracks me up that the PCI Data Security Standard calls encryption, “the ultimate security technology” (I think they pulled that line out of the 1.1 version). Encryption is just another tool in the box, albeit a useful one. There is no “ultimate” technology. Unless, of course, you’d like to pay me a very reasonable fee and I’ll provide it to you. Just sign this little EULA agreement not to disclose any benchmark or… oh heck, not to disclose anything at all. Earlier this year I published a note over with my employer entitled “The Three Laws of Data Encryption”. While I can’t release the note content here (because of the whole wanting to stay employed thing, and if they don’t make money I don’t) here are the three laws as a teaser (since they’ve been published in a few public news articles). Basically, there are only three reasons to encrypt: If data moves, physically or virtually. E.g. laptops, backup tapes, email, and EDI. To enforce separation of duties beyond what’s possible with access controls. Usually this only means protecting against administrators, since access controls can stop everyone else. Examples include credit card or social security numbers in databases (when you separate keys from admins) and files in shared storage. Because someone tells you you have to. I call this “mandated encryption”. You G clients should check out the note if you want more details (actually, if any of you start using Gartner because of this blog please let me know via email). While the “laws” are totally fracking obvious I’ve found a lot of people run around trying to encrypt without taking the time to figure out what the threats are and if encryption will offer any real value. Like encrypting a column in a database and having the DBA manage the keys. What are you protecting against? And “hackers” isn’t the answer. Share:

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