System for controlling access to a secure system by verifying acceptability of proposed password by using hashing and group of unacceptable passwords
US5204966A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 9, 1990 |
| Grant date | Apr 20, 1993 |
| Priority date | — |
| Expiry date | Mar 9, 2010 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG07C9/33
- WIPO fieldControl
- WIPO sectorInstruments
Abstract
Methods and apparatus for verifying the acceptability of a password proposed by a user of a secure system. The system stores a compressed version of a group of unacceptable passwords in a table of indicators. A mapper assigns indicators to passwords, such that more than one password may be mapped to a indicator. To initialize the system, an initializer applies the mapper to each unacceptable password of the group, and sets the indicators of the table that are assigned to each unacceptable password. Subsequently, a verifier applies the mapper to a proposed password and checks whether the indicator assigned to the proposed password is set. If the indicator is not set, it is determined without error that the proposed password is not in the group of unacceptable passwords, and may thus be assigned privileges in the secure system.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.