The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 11, 2001
Filed:
Jul. 26, 1996
Masao Murota, Kanagawa-ken, JP;
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Abstract
A scheme for encrypting and transferring electronic mails which enables the realization of the information management regarding encrypted electronic mails by an electronic mail manager, and the transfer control regarding encrypted electronic mails. A management encryption key information is produced by encrypting the message encrypting key according to a public-key cryptography by using a prescribed management public key, in addition to the usual sender's encryption key information and each receiver's encryption key information. The encrypted electronic mail is then constructed from the encrypted message, the sender's encryption key information, each receiver's encryption key information and the management encryption key information. At a time of transferring the electronic mail, whether this electronic mail is an encrypted electronic mail or not is identified and whether a transfer of this electronic mail is permitted or not is judged according an identification result.