Two entries on big data lead this week’s edition of DLTJ Thursday Threads. The first is at the grandest scale possible: a calculation of the amount of information in the world. Add up all the digital memory (in cell phones, computers, and other devices) and analog media (for instance, paper) and it goes to a very big number. The authors try to put it in perspective, which for me brought home how insignificant my line of work can be. (All of our information is still less than 1% of what is encoded in the human DNA?) The second “big data” entry describes an effort to make sense of huge amounts of data in the National Archives through the use of visualization tools. Rounding out this week is a warning to those who run public computers — be on the look-out for key loggers that can be used to steal information from users.
This week’s Thursday Threads looks at a big hole in the security model of most internet sites that require you to log into them with a username and password plus a pair of stories about “big media” battles. If you find these interesting and useful, you might want to add the Thursday Threads RSS Feed to your feed reader or subscribe to e-mail delivery using the form to the right. If you would like a more raw and immediate version of these types of stories, watch my FriendFeed stream (or subscribe to its feed in your feed reader). Comments, as always, are welcome.
You are using lockdown security cables to protect your PCs, but your accessories — keyboards, mice, and other cables — are still vulnerable to theft. You can use one of these specially built products to lock down the cables, or you can use a 20¢ flat washer from the hardware store to protect these components from minor mischief.
Week #2 of this new project to highlight interesting tidbits from the previous seven days. Well, things that were interesting to me that I hope will be interesting to DLTJ readers. Time will tell.
Most e-mail messages I send are digitally signed using a process called “Pretty Good Privacy“, or PGP. In e-mail applications that don’t understand PGP, this digital signature will show up either as an attachment called “PGP.sig” or as a part of the message starting with “BEGIN PGP SIGNATURE” at the bottom of the e-mail. This file — containing gibberish to the human eye — is used by PGP-aware programs to verify that the message actually came from me. If you are using PGP, I could also sent you a message that only you could read (e.g. “encrypted”). This page gives some background on PGP and why I consider it important.
It is the start of a new year1, and it seems like a good time to update my public encryption key. My previous one — created in 2004 — is both a little weaker, cryptographically speaking, than the ones newly created (1024-bit versus 2048-bit) and also an uncomfortable mixing of my professional and personal lives. For my previous key, I attached all of my professional and personal user ids (e.g. e-mail addresses) to the same key. This time I decided to split my work-related user ids from my other ones. My reasoning for the split is that I might be compelled by my employer to turn over my private key to decrypt messages and files sent in the course of my work. If my personal user ids are also attached to that private key, my employer (and who ever else got ahold of that key), would be able to decrypt my personal messages and files as well. That is not necessarily a good thing. So my solution was to create two keys and cross-sign them. I’ve outlined the process below.
These keys are part of a computer standard and software algorithm called “Pretty Good Privacy“, or PGP. If you are interested in more of a background about PGP, see a companion post on why I digitally sign my e-mail.
- Some have even said it is the start of a new decade, but of course that isn’t true. We won’t start a new decade until 2011, just like we didn’t actually start a new millennium until 2001. [↩]