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[upki-fed:01315] 【重要】meatwikiアカウント整理のお知らせ
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Revision History

Rev.

Date (YYYY/MM/DD)

Description

Editor

V.1.0

2015/4/1

First revision

NII

V.1.1

2016/12/26

Amendment with addition of [NII Open Domain S/MIME CA] as a new Certificate Authority

NII

V2.0

2018/2/26

Supported environment update: Mozilla Thunderbird 52.0 or later

NII


Table of Content

1. Installing the S/MIME Certificate
1-1. Operating Environment
1-2. Prerequisites
1-3. Install Procedure
2. Sending Digitally Signed E-mails
2-1. Sending Digitally Signed E-mails
2-2. How to Confirm a Sent E-mail That Was Digitally Signed

1. Installing the S/MIME Certificate


1-1. Operating Environment

The procedures only in the following environment are described in this document:

Supported environment:

Mozilla Thunderbird 52.0 or later


1-2. Prerequisites

The prerequisites for using the S/MIME Certificate in Mozilla Thunderbird are described.
Replace the technical terms according to the user environment in which the S/MIME Certificate will be used.
(The procedures required for Mozilla Thunderbird 52.0 are described in this document.)

Prerequisites

  1. The S/MIME Certificate has been installed in the web browser
    (described in the User's Manuals for Installation in Different Web Browsers: Mozilla Firefox Edition); and
  2. Mozilla Thunderbird 52.0 or later is installed.


1-3. Install Procedure

Installing the Certificate

  1. Open Mozilla Thunderbird, right click on the [mailuser] (account name) and select [Settings (E)].


  2. The [Account Settings] screen will appear. Select [Security] in the account profile, listed on the left. Click [Manage Certificates...(M)].


  3. In the [Certificate Manager] pane, select [Your Certificates] tab and click [Import... (M)].


  4. As you can browse the certificate file(s) to import, select the certificate to import and click [Open (O)].


  5. The [Password Entry Dialog] box will pop up. Enter the password for encrypting this certificate backup in the [Password:] box, and click [OK].  


  6. Click [OK] in the [Alert] dialog box.  


  7. In the [Certificate Manager] pane, make sure that the certificate is now installed, and click [OK].


  8. The [Account Settings] screen will appear. Select [Security] in the account profile, listed on the left. Click [Select...(S)].


  9. In the [Select Certificate] dialog box, select the S/MIME Certificate from the [Certificate] drop down list, and click [OK].


  10. Click [No (N)].


  11. Check the [Digitally sign messages (by default) (D)] checkbox, and click [OK].


    This completes the S/MIME Certificate installation.


2. Sending Digitally Signed E-mails

2-1. Sending Digitally Signed E-mails

How to Send Digitally Signed E-mails

  1. Open Mozilla Thunderbird, and click the [Write] button.


  2. In the [Write: Foobar] screen, click the downward arrow on the right side of the [Security] button and select [Digitally Sign This Message (M)] from the drop down list.


  3. Write the message. 
    When finished, click [Send].


    This completes sending digitally signed e-mails.


2-2. How to Confirm a Sent E-mail That Was Digitally Signed

How to Confirm a Sent E-mail That Was Digitally Signed

  1. Select a sent e-mail that was digitally signed from the [Sent] folder.


  2. Click the [Envelope] icon.  


  3. In the [Message Security] dialog box, click [View Signature Certificate].


  4. The [Certificate Viewer] will appear. Select the [General (G)] tab and make sure that the tab shows "This certificate has been verified for the following uses:" on its top.


    This completes confirmation of a sent e-mail that was digitally signed.


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