Slashdot Mirror

rangeva writes to tell us about a twist he has developed on the common Captcha technique to discourage spam bots: HECs encode the Captcha image into HTML, thus presenting an unsolved challenge to the bots' programmers. From the writeup: "The Captcha is no longer an image and therefore not a resource they can download and process. The owner of the site can change the properties of the Captcha's HTML, making it unique,... add[ing] another layer of complication for the bot to crack." HECs are not exactly lightweight — the one on the linked page weighs in at 218K — but this GPL'd project seems like a nice advance on the state of the art.

rangeva writes to tell us about a twist he has developed on the common Captcha technique to discourage spam bots: HECs encode the Captcha image into HTML, thus presenting an unsolved challenge to the bots' programmers. From the writeup: "The Captcha is no longer an image and therefore not a resource they can download and process. The owner of the site can change the properties of the Captcha's HTML, making it unique,... add[ing] another layer of complication for the bot to crack." HECs are not exactly lightweight — the one on the linked page weighs in at 218K — but this GPL'd project seems like a nice advance on the state of the art.

rangeva writes "As anti-spam solutions evolve to limit junk email, the senders quickly adapt to make sure their messages are seen. an interesting article describes the application of an artificial immune system model to effectively protect email users from unwanted messages. In particular, it tests a spam immune system against the publicly available SpamAssassin corpus of spam and non-spam. It does so by classifying email messages with the detectors produced by the immune system. The resulting system classifies the messages with accuracy similar to that of other spam filters, but it does so with fewer detectors."

rangeva writes "Nature is reporting that Van Gogh works have a pattern of light and dark that closely follows the mathematical structure of turbulent flow. From the article: 'Vincent van Gogh is known for his chaotic paintings and similarly tumultuous state of mind. Now a mathematical analysis of his works reveals that the stormy patterns in many of his paintings are uncannily like real turbulence, as seen in swirling water or the air from a jet engine.'"