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How to decrypt a .p7m file and verify its signature?

Entrust Client allows for the verification of the digital signature and decryption of a document encrypted within a .p7m file.

This software is available in our download section. You will require administrative rights to complete the installation (Please note: downloading the software is free and will be mandatory before proceeding with the instructions below).

Extract the document

• Confirm that the Entrust Client is installed
• From the Windows Explorer, right-click on the .p7m file
• Select Decrypt and Verify (even if the document is not encrypted)

Verifying the signature

• Confirm that the Entrust Client is installed
• From the Windows Explorer, right-click on the .p7m file and select Properties
• Click on the Security Status tab (Please note: The information displayed will be insufficient for the signature validation)

• To validate the signer’s identity, select View Certificate. Then, click on the Details tab. Lastly, select the Subject field. You will have access to the signer’s complete details.
  • SERIALNUMBER = Professional identification number
  • CN = Signer’s name
  • OU = Professional association
  • O = CENTRE DE CERTIFICATION DU QUÉBEC (CCQ)
  • C = CERTIFICATION AUTHORITY (CA)