Usability

I was irked to see a tweet “Learned a new word! Pseudoarboricity: the number of pseudoforests needed to cover a graph. Yes, it is actually a word and so is pseudoforest.” The idea that some letter combinations are “actual words” implies that others are “not actual words,” and thus, that there is some authority who…

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I’m having a problem where the “key identifier” displayed on my ios device does not match the key fingerprint on my server. In particular, I run: % openssl x509 -in keyfile.pem -fingerprint -sha1 and I get a 20 byte hash. I also have a 20 byte hash in my phone, but it is not that…

Read More IOS Subject Key Identifier?

In light of recent news, such as “FreeBSD washing Intel-chip randomness” and “alleged NSA-RSA scheming,” what advice should we give engineers who want to use randomness in their designs? My advice for software engineers building things used to be to rely on the OS to get it right. That defers the problem to a small…

Read More What to do for randomness today?

It’s common to hear that Facebook use means that privacy is over, or no longer matters. I think that perception is deeply wrong. It’s based in the superficial notion that people making different or perhaps surprising privacy tradeoffs are never aware of what they’re doing, or that they have no regrets. Some recent stories that…

Read More A Quintet of Facebook Privacy Stories