| Name | Last modified | Size | Description | |
|---|---|---|---|---|
| Parent Directory | - | |||
| Voice Scramblers.pdf | 2009-09-08 02:58 | 2.2M | ||
| Voice Scrambler.pdf | 2009-01-15 04:43 | 364K | ||
| Vocal Truth Analyzer.pdf | 2009-09-20 23:43 | 903K | ||
| Speech Scrambler.pdf | 2009-03-25 06:15 | 645K | ||
| Experiments in Voice Recognition.pdf | 2009-09-28 02:38 | 1.1M | ||
| Electronic Sequential Combination Lock.pdf | 2020-07-07 18:50 | 2.0M | ||
| Electronic Security Systems - Overview.pdf | 2012-03-08 04:18 | 616K | ||
| Electronic Locks - Misc.pdf | 2009-09-22 05:37 | 4.9M | ||
| Electronic Combination Lock.pdf | 2009-01-12 02:09 | 60K | ||
| DigiStart Lock Errata PE 1977-04.pdf | 2020-07-03 21:45 | 184K | ||
| Deciphering Secret Messages.pdf | 2011-06-20 02:20 | 477K | ||
| Crypto Lock.pdf | 2009-07-21 06:16 | 286K | ||
| Bugging.pdf | 2018-07-10 01:47 | 6.0M | ||
| Bug Detector.pdf | 2018-07-10 01:51 | 3.5M | ||
| Audio Scrambling System Article Comments.pdf | 2011-07-06 05:12 | 176K | ||
| Audio Scrambling System.pdf | 2014-02-09 06:23 | 614K | ||
| Access Control Systems.pdf | 2012-03-08 04:01 | 390K | ||