FYI (second article near the bottom of this message). Bill
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]] Sent: Friday, January 03, 2003 10:38 To: [EMAIL PROTECTED] Subject: Physics News Update 619 PHYSICS NEWS UPDATE The American Institute of Physics Bulletin of Physics News Number 619 January 3, 2003 by Phillip F. Schewe, Ben Stein, and James Riordon X-RATED INTERFEROMETRY. The appearance of an x-ray interference pattern in a Fabry-Perot interferometer has been achieved, for the first time, by a group of physicists at the University of Hamburg (Yuri Shvyd'ko, [EMAIL PROTECTED], 49-40-8998-2200). This might lead to a new generation of x-ray optical devices, such as high-resolution x-ray spectral filters, or x-ray clocks, and, more important still, a new way of calibrating length measurements at the atomic scale. X-rays are a potent type of electromagnetic radiation, with a much higher energy and smaller [...] the cavity, the spectral sharpness of the Fabry-Perot interference fringes was estimated to be less than a micro-electron-volt. This is more than 100 times better than the best x-ray crystal monochromators can do. (Shvyd'ko et al., upcoming article in Physical Review Letters; accompanying figure will be posted on Jan 6 at www.aip.org/mgr/png ; see also related PRL article, 17 July 2002; http://focus.aps.org/story/v6/st2 ) FEASIBLE CHAOTIC ENCRYPTION. Encryption schemes that hide messages in chaotic signals have attracted attention in recent years as a means to transmit information securely (Update 170, 361), but most work has been either theoretical or strictly limited to laboratory experiments. Now a group of researchers in Beijing have managed to demonstrate chaotically encrypted, two-way voice transmission through the Beijing Normal University computer network. With a 32-bit encryption structure, a 750 MHz personal computer can encode information at speeds comparable to the widely recognized Advanced Encryption Standard, and support voice communication at typical telephone speeds and quality. While no encryption technique is absolutely impenetrable, the researchers (Hu Gang, Beijing Normal University, [EMAIL PROTECTED], 86-10-62208420) explain that their communication scheme is reasonably secure (it would take an intruder armed with a personal computer more than a million times the lifetime of the universe to break the code) as well as being feasible in realistic, commercial settings. (S. Wang et al., Physical Review E, December 2002.) *********** PHYSICS NEWS UPDATE is a digest of physics news items arising from physics meetings, physics journals, newspapers and magazines, and other news sources. It is provided free of charge as a way of broadly disseminating information about physics and physicists. For that reason, you are free to post it, if you like, where others can read it, providing only that you credit AIP. Physics News Update appears approximately once a week. AUTO-SUBSCRIPTION OR DELETION: By using the expression "subscribe physnews" in your e-mail message, you will have automatically added the address from which your message was sent to the distribution list for Physics News Update. If you use the "signoff physnews" expression in your e-mail message, the address in your message header will be deleted from the distribution list. Please send your message to: [EMAIL PROTECTED] (Leave the "Subject:" line blank.) --------------------------------------------------------------------- The Cryptography Mailing List Unsubscribe by sending "unsubscribe cryptography" to [EMAIL PROTECTED]
