USE-SC4: ULTIMATE SECURITY ENCRYPTION ===================================== copyright 2000 Down To Earth Software, all rights reserved. Updates available at: http://www.dte.net/software Email: software@dte.net current version: 1.1.1 Released: 03/16/00 SUMMARY: -------- USE-SC4 uses a strong encryption Stream Cipher based on the RC4 algorithm. It utilizes a 256-byte key with byte-oriented operations. Default hashing functions employ SHA, and the program can also be configured for MD5 hashes. An advanced implementation of salt(IV) and algorithm priming is also incorporated into the program. The algorithm is based on the use of random permutation. Analysis shows that the period of the cipher is overwhelmingly likely to be greater than 10 to the power of 100. The cipher code has been optimized and will run very quickly on most hardware. The RC4 algorithm has been scrutinized by independent analysts and is considered secure. USE-SC4 also detects file tampering and warns accordingly. TIPS FOR MAXIMUM SECURITY: -------------------------- Password security is the most important factor regardless of the cipher used. Passwords should be 12 characters in length or longer and should contain numbers and symbols. Use of numbers only is not recommended. EASE OF USE: ------------ USE-RC4's interface is intuitive and easy to use. You may select multiple files by holding down the control key while making selections. You may delete one file at a time by selecting a single file and pressing the delete key. You may also use shift-A while selecting the last file in the filebox to select all files in that directory. Pressing F5 will refresh the directory and file boxes. The up arrow graphic at the top of the 'directories' box enables you to easily move up one directory in the file tree. You may also enter your own file types in the drop down box for easy filtering. Your settings are remembered and reloaded when you start the program again. MINIMUM SYSTEM REQUIREMENTS FOR USE-SC4: ---------------------------------------- 1) Windows 95 486 class computer 8 MBytes of RAM VGA-class monitor 2) Windows 98 486 class computer 12 MBytes of RAM VGA-class monitor 3) Windows NT 4.0 486 class computer 16 MBytes of RAM VGA-class monitor 4) Windows 2000 Pentium class computer 32 MBytes of RAM VGA-class monitor END-USER LICENSE AGREEMENT (EULA): ---------------------------------- IMPORTANT-READ CAREFULLY: This Down To Earth Software End-User License Agreement (EULA) is a legal agreement between you (either an individual or a single entity) and Down To Earth Software for the USE-SC4 software product and any accompanying electronic documentation (SOFTWARE PRODUCT or SOFTWARE). By installing, copying, or otherwise using the SOFTWARE PRODUCT, you agree to be bound by the terms of this EULA. If you do not agree to the terms of this EULA, you are not authorized to use the SOFTWARE PRODUCT. The SOFTWARE PRODUCT is protected by copyright laws and international copyright treaties, as well as other intellectual property laws and treaties. The SOFTWARE PRODUCT is licensed, not sold. 1. GRANT OF LICENSE. This Down To Earth Software License Agreement (“License”) permits you to use one copy of USE-SC4 (“SOFTWARE”) on any single computer, provided the SOFTWARE is in use on only one computer at any time. If you have multiple licenses for the SOFTWARE, then at any time you may have as many copies of the SOFTWARE in use as you have licenses. The SOFTWARE is “in use” on a computer when it is loaded into the temporary memory (i.e., RAM) or installed into the permanent memory (e.g., hard disk, CD-ROM, or other storage device) of that computer, except that a copy installed on a network server for the sole purpose of distribution to other computers is not “in use.” If the anticipated number of users of the SOFTWARE will exceed the number of applicable Licenses, then you must have a reasonable mechanism or process in place to assure that the number of persons using the SOFTWARE concurrently does not exceed the number of Licenses. If the SOFTWARE is permanently installed on the hard disk or other storage device of a computer (other than the network server), and one person uses that computer more than 80% of the time it is in use, then that person may also use the SOFTWARE on a portable or home computer. 2. COPYRIGHT. The SOFTWARE is owned by Down To Earth Software or its suppliers and is protected by United States copyright laws and international treaty provisions. Therefore, you must treat the SOFTWARE like any other copyrighted material (e.g., a book or musical recording) except that you may either (a) make one copy of the SOFTWARE solely for backup or archival purposes, or (b) transfer the SOFTWARE to a single hard disk provided you keep the original solely for backup or archival purposes. You may not copy the written materials accompanying the SOFTWARE. 3. OTHER RESTRICTIONS. This Down To Earth Software agreement is your proof of license to exercise the rights granted herein and must be retained by you. You may not rent or lease the SOFTWARE, but you may transfer your rights under this Down To Earth Software Agreement on a permanent basis provided you transfer this License Agreement, the SOFTWARE, and all accompanying written materials and retain no copies, and the recipient agrees to the terms of this Agreement. You may not reverse-engineer, decompile, or disassemble the SOFTWARE. Any transfer of the SOFTWARE must include the most recent update and all prior versions. LIMITED WARRANTY: ----------------- Down To Earth Software warrants that the SOFTWARE will perform in accordance with the accompanying written materials for a period of ninety (90) days from the date of receipt; Any implied warranties on the SOFTWARE are limited to ninety (90) days. Some states do not allow limitations on duration of an implied warranty, so the above limitation may not apply to you. CUSTOMER REMEDIES: ------------------ Down To Earth Software's entire liability and your exclusive remedy shall be, at Down To Earth Software's option, either (a) return of the price paid or (b) repair or replacement of the SOFTWARE that does not meet Down To Earth Software's Limited Warranty and that is returned to Down To Earth Software with a copy of your receipt. This Limited Warranty is void if failure of the SOFTWARE has resulted from accident, abuse, or misapplication. Any replacement SOFTWARE will be warranted for the remainder of the original warranty or thirty (30) days, whichever is longer. Neither these remedies nor any product support services offered by Down To Earth Software are available for this USA-version of the product outside of the United States of America. NO OTHER WARRANTIES: -------------------- Down To Earth Software disclaims all other warranties, either express or implied, including but not limited to implied warranties of merchantability and fitness for a particular purpose, with respect to the SOFTWARE and the accompanying written materials (if any). This limited warranty gives you specific legal rights. You may have others, which vary from state to state. NO LIABILITY FOR CONSEQUENTIAL DAMAGES: --------------------------------------- In no event shall Down To Earth Software or its suppliers be liable for any damages whatsoever (including, without limitation, damages for loss of business profits, business interruption, loss of business information, or other pecuniary loss) arising out of the use of or inability to use this Down To Earth Software product, even if Down To Earth Software has been advised of the possibility of such damages. Because some states do not allow the exclusion or limitation of liability for consequential or incidental damages, the above limitation may not apply to you. U.S. GOVERNMENT RESTRICTED RIGHTS: ---------------------------------- The SOFTWARE and documentation (if any) are provided with RESTRICTED RIGHTS. Use, duplication, or disclosure by the Government is subject to restrictions as set forth in subparagraph (c)(l)(ii) of the Rights in Technical Data and Computer Software clause at DFARS 252.227-7013 or subparagraphs(c)(l) and (2) of the Commercial Computer Software--Restricted Rights at 48 CFR 52.227-19, as applicable. Contractor/manufacturer is Down To Earth Software, PO BOX 222. Montclair, CA 91763. This agreement is governed by the laws of the State of California. For more information about Down To Earth Software's licensing policies, please contact Down To Earth Software Customer Service at software@dte.net, or write to: Down To Earth Software. PO BOX 222. Montclair, CA 91763 VERSION INFORMATION: -------------------- Version 1.1.1 Released 03/16/00 `````````````````````````````````````````` Implemented algorithm priming to further increase security. Version 1.1.0 Released 03/16/00 `````````````````````````````````````````` Implemented advanced salt(IV) techniques to avoid 'weak key' vunerabilities. Version 1.0.1 Released 03/11/00 `````````````````````````````````````````` Fixed problem with performance testing under WindowsNT/2000. Fixed algorithm problems when more than one file being processed. Version 1.0.0 Released 03/10/00 `````````````````````````````````````````` First release.