How to encrypt PDF documents?
Using the Adobe Professional Suite and ACS' CSP Middleware, users can sign and encrypt PDF documents using certificates that are stored on the ACOS5 Card/CryptoMate devices.
Before encrypting PDFs, user must ensure that he/she had requested a digital certificate from a trusted CA.
As an example, we will use Adobe Professional Suite 8 for the steps discussed below.
Encrypting your PDF documents ensures that only the intended readers can decrypt and properly read your documents.
To encrypt PDF documents:
- Make sure that your ACOS5 card is inserted in the reader. If you are using a CryptoMate Device, make sure that it is inserted in a USB slot.
- Start the Adobe Professional Suite.If you have properly installed the Adobe Pro Suite, you should see a welcome screen similar to the one below (Figure 1).
Figure 1: Creating a PDF using Adobe Pro Suite 8.
- Select "CREATE PDF". You can easily create a PDF document that comes from a *.doc, a .txt file or even from multiple files. Select the proper source file for your PDF documents (Figure 2).
Figure 2: Select the appropriate source file in creating your PDF document.
- Once you have your PDF document ready, select the "Secure" Drop down button in the main panel of the Adobe Pro Suite (Figure 3).
Figure 3: Encrypting a PDF document in Adobe Pro Suite 8.
- Select "Certificate Encrypt" in the Drop down menu. A "Certificate Security Settings" dialog box will appear. You will be prompted for the General settings panel, Click "Next" to proceed to selecting recipients.
- The next panel will allow you to select the recipients. In this section you can now add the intended readers of your encrypted PDF document. This is the most important part of encrypting your document. If you don't add any recipients in this section, then your the only one who will be able to decrypt and read it properly.
- To add recipients of your document, you should first have a copy of the .cer certificate file of your recipient's digital certificate. If your recipients use ACOS5/CryptoMate to store their Digital Certificate, then they can easily export their digital certificate using Admin Tool.
- Click the "Browse..." button to add recipients for your encrypted document. Browse to where the *.cer file is located and then Click "OK" (Figure 4).
Figure 4: Click "Browse..." to select the .cer file and then add them as your recipients.
- You can add as many recipients in your document as you want, as long as you have a copy of their *.cer digital certificate file. Click "Next" and then Click "Finish". Your PDF document is now encrypted, you can now start sending it to your intended recipients.
- When your recipients recieve the PDF document and they are also using ACOS5/CryptoMate to store their digital certitificates, they will be prompted for the Card/Token PIN (Figure 5).
Figure 5: Opening an encrypted PDF file in Acrobat Reader 7.