Category Archives: uncategorized


Lots of digital cameras come with a default file-naming scheme of IMG_nnnn, where nnnn is a four-digit number assigned sequen­tially, starting with 0001. The four images above are photos I made with four different cameras over a span of more … Continue reading

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Computing with encrypted data

Let’s suppose you are a client of the notorious accounting firm Dewey, Cheetham & Howe. You want them to compute your income tax, but you don’t trust them with the confidential details of your financial life. This impasse seems insurmountable. … Continue reading

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Kepler’s snowflake

The Kepler conjecture—the one about stacking cannonballs or oranges—is now the Hales theorem, though with a cruelly lingering asterisk. Thomas C. Hales announced his proof in 1998, and it was published in 2005 and 2006 (links). But the referees were unable to fully … Continue reading

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Painting the world with pixels

You are guiding your cart down the aisles of the supermarket when the price tag on the Cheerios beckons to you. Literally. An animated figure on the shelf tag waves and signals for you to come closer. When the array … Continue reading

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Security theater on the web

Perhaps the most important security concept within modern browsers is the idea of the same-origin policy. The principal intent for this mechanism is to make it possible for largely unrestrained scripting and other interactions between pages served as a part … Continue reading

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