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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.

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First Claim