Communication device and a control method therefor that perform authentication using digital certificates
US9467323B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | May 5, 2015 |
| Grant date | Oct 11, 2016 |
| Priority date | — |
| Expiry date | May 5, 2035 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG06F3/1285
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
Abstract
A communication device having time information that may not be correct can efficiently and accurately authenticate a server certificate. The communication unit of a printer processes server authentication that inspects a server certificate when connecting to an external network. Server authentication includes a first authentication that verifies the validity period of the server certificate based on status information and time information stored by the communication unit. The communication unit cuts the connection to the external network if the time information stored by the communication unit is after the validity period (the validity period is clearly expired). The first authentication reliably succeeds if the communication unit has the correct time information and a valid server certificate. If the time information is before the validity period, the time information may be old, and processing proceeds based on the status information.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.