System for encryption and identification
US5161190A · kind A · utility
12Cited by
5References
11Claims
0Family size
Assignee
Inventor
Key dates
| Filing date | Oct 5, 1990 |
| Grant date | Nov 3, 1992 |
| Priority date | — |
| Expiry date | Oct 5, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F21/83
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
A delay means in a security apparatus for identifying a code of characters to authenticate access to the apparatus by matching an entered code with a stored value by a procedure which so enciphers the coded information as it is entered into the apparatus and displayed on a keyboard that disclosure of the code by observation of the entry operation is prevented. A delay timing circuit produces a delayed signal in the matching of the entered code and the stored value so that the length of the period of time for authentication is controllable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.