The August issue of Linux Journal (#40) will be printed 16 June 1997 and will be mailed from the printers in Post Falls, Idaho on 30 June 1997. TABLE OF CONTENTS LINUX JOURNAL AUGUST 1997 FEATURES Wrap a Security Blanket Around Your Computer TCP_wrappers: a simple, elegant and effective means to safeguard your network services. by Lee E. Brotzman Designing a Safe Network Using Firewalls It is by no means necessary to purchase specialized firewall hardware or even software. A Linux server<\#151>running on a $400 386 PC<\#151>provides as much protection as most commercial firewalls, with much greater flexibility and easier configuration. by Paul Wouters TCFS: Transparent Cryptographic File System Think of TCFS as an extended NFS. It acts just like NFS, but allows a user to protect files using encryption. by Ermelindo Mauriello Tripping up Intruders with Tripwire You can ensure the security of your Linux machine with this program. by Kevin Fenzi NEWS & ARTICLES Security and Authentication with Digital Signatures by Robb Shecter Interview with Sameer Parekh by James T. Dennis Programming with the XForms Library, Part 2: Writing an Application by Thor Sigvaldason WWWsmith At the Forge: Templates: Separating Programs from Design Keeping the design of web pages consistent through the use of HTML pages with embedded Perl code. by Reuven M. Lerner A Web Crawler in Perl How to write a spider, or web-crawling robot, in Perl. by Mike Thomas COLUMNS Letters to the Editor From the Editor Stop the Presses: Action on Linux Trademark Book Review: The Java Series New Products Linux Gazette: Big Brother Network Monitoring System Book Review: Linux A-Z Book Review: The Linux Database Kernel Korner: A Non-Technical Look inside the EXT2 File System System Administration: SATAN: Analyzing Your Network Product Review: XVScan Product Review: Berkshire PC Watchdog The Best of Tech Support DIRECTORIES Consultants Directory Advertisers Index Marketplace Linux Journal is carried by some newsstands (including all Computer Literacy stores in Silicon Valley) and is delivered to newsstands by a newsstand distributor. If you know a place that sells magazines that you feel should stock LJ, send e-mail to dist@ssc.com or have them call SSC at 206-782-7733. Getting LJ on newsstands is one of the best ways we can show the non-Internet crowd that Linux is for real. Subscriptions are: US$22/year U.S. US$27/year Canada US$32/year Foreign US$39/2 years U.S. US$49/2 years Canada US$54/2 years Foreign Linux Journal P.O. Box 85867 Seattle, WA 98145-1867 Fax: +1 206-782-7191 Tel: +1 206-782-7733 E-mail: subs@ssc.com URL: http://www.ssc.com/lj/ Our public key (for encrypting your credit card number) is available by fingering info@ssc.com. Subscriptions begin with the *upcoming* issue. Back issues are available (except for Issues #1, #3, #4, #5, #7 and #30, we're out) for $5 each, or $7 each non-North American airmail. ***Note: All funds should be in U.S. dollars*** Other questions/comments can be sent to: linux@ssc.com