Alexandre Stefanov long maintained a list of online math texts and other materials at Geocities, but it appears that his original web site is no longer available. Because these resources may be of interest to our readers, we present here a modified version of Stefanov's list as of November 18, 2009. We welcome corrections or suggested additions to this list.

Forums for discussing modern cryptographic practice. As of 2016-07-19, there are two mailing lists:
Curves - Elliptic curve cryptography.
 New curves, implementation techniques, and protocols such as PAKE and  
 signatures.

Messaging - Secure end-to-end messaging.
 New approaches to key management, authentication, usability, and deployment.

Found on
http://www.zeit.de/wirtschaft/2016-04/ttip-usa-eu-antiamerikanismus-freihandelszone-campact

Information about programming microprocessors, particularly the Arduino.

SMART stats are inconsistent from hard drive to hard drive.

With nearly 40,000 hard drives and over 100,000,000 GB of data stored for customers, we have a lot of hard-won experience. See which 5 of the SMART stats are good predictors of drive failure below. And see the data we have started to analyze from all of the SMART stats to see which other ones predict failure.

Articles about software complexity. The sanos operating system and the PDP-11 emulator running under it are interesting too.
http://www.jbox.dk/sanos/pdp11.htm

Unix philosophy and -programming, in german.

JEROME H. SALTZER, SENIOR MEMBER, IEEE, AND
MICHAEL D. SCHROEDER, MEMBER, IEEE
Invited Paper

Manuscript received October 11, 1974; revised April 17. 1975. Copyright © 1975 by J. H. Saltzer.
The authors are with Project MAC and the Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology Cambridge, Mass. 02139.

Abstract - This tutorial paper explores the mechanics of protecting computer-stored information from unauthorized use or modification. It concentrates on those architectural structures--whether hardware or software--that are necessary to support information protection. The paper develops in three main sections. Section I describes desired functions, design principles, and examples of elementary protection and authentication mechanisms. Any reader familiar with computers should find the first section to be reasonably accessible. Section II requires some familiarity with descriptor-based computer architecture. It examines in depth the principles of modern protection architectures and the relation between capability systems and access control list systems, and ends with a brief analysis of protected subsystems and protected objects. The reader who is dismayed by either the prerequisites or the level of detail in the second section may wish to skip to Section III, which reviews the state of the art and current research projects and provides suggestions for further reading.

Description of pluggable authentication modules for Linux, from 1997.

Hints and a link to instructions for getting CCL on the Raspberry Pi.