Electronic mail transmission and reception system
US8341418B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Oct 23, 2007 |
| Grant date | Dec 25, 2012 |
| Priority date | — |
| Expiry date | Nov 17, 2029 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH04L51/212
- WIPO fieldDigital communication
- WIPO sectorElectrical engineering
Abstract
An electronic mail transmission/reception system is provided, capable of maintaining the confidentiality of restricted attachments desired to be limited in destination, thereby ensuring the security of the restricted attachments. A system management server 11 of an electronic mail transmission/reception system 10 includes: first conversion means for hashing a restricted attachment intended for a predetermined destination by a one-way hash function, and converting the restricted attachment into a first hash output value; first storage means for storing the first hash output value for the restricted attachment converted via the first conversion means; second conversion means for hashing a received attachment by the one-way hash function, and converting the attachment into a second hash output value; and destination restriction means for comparing the first hash output value with the second hash output value, and when these hash output values are equal, transmitting the attachment corresponding to the second hash output value only to the predetermined destination.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.