SQLServerCentral Editorial

Protecting the Encryption Keys


There was an interesting debate on SQLServerCentral recently after John Magnabosco wrote an editorial about encryption. I had chimed in that I thought adding encryption keys to the things you need to protect was harder than just backing up your data. Someone else disagreed, and we debated the issue back and forth.

It seems to me that it's harder, but I'm really not sure. I think you need a separate backup process, and a more complex recovery process, but perhaps that's not true. Maybe I'm just over-thinking it.  Since it's Friday, I decided this would make a good poll.

Is protecting your encryption keys harder than just making a backup?

I've always thought that a best practice was to keep the keys separate from the data, or in this case, the backup. Which means that I need to have a different media, and preferably a different location. That means it's a whole separate process.

The other thing that seems more complex is that you're want to rotate keys periodically. Otherwise if someone got the key, they could theoretically brute-force the key. I know it's supposed to take years, but it seems that hardware advances are always making this take less time than originally estimated. And what if someone managed to secure the first letter or two? I bet it's crackable in reasonable times.  However if you rotate keys, then the time frames shrink, perhaps too small to be worth the effort.

If you rotate keys, then you need to ensure that somehow you can match up the key with the backup. If I think across time, this seems complicated, but the reality is for DR situations it would be one of two keys (the current and the past). For other situations, like legal issues where you might go back over a year, perhaps it's more complicated.

I'm curious what other people do, or what they think. Is this harder?

Steve Jones

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