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Using Your YubiKey with Outlook on Windows

These instructions will show you how to use an S/MIME certificate installed in a YubiKey to send signed and/or encrypted email in Outlook on Windows. Note: These instructions assume that you have installed an encryption-enabled S/MIME certificate in the Key Management slot (9c) of your » Continue Reading.

November 2019 Security Roundup

  Welcome to November 2019’s edition of’s Security Roundup, where we present a selection of the month’s developments in SSL/TLS, digital certificates, and network security! In this edition, we’ll be covering: TPM-FAIL: newly-discovered vulnerabilities in Intel firmware-based TPM and STMicroelectronics’ TPM chips Delegated Credentials » Continue Reading.

What is Public-Key Cryptography?

Public-Key Cryptography, which is also known as asymmetric cryptography, is a system that uses pairs of keys to encrypt and authenticate information. One key in the pair is a public key which can, as the name suggests, be distributed widely without impacting security. The second » Continue Reading.

Sign a PDF in Adobe Acrobat Reader

This how-to will show you how to sign a PDF document in Adobe Acrobat Reader with a document signing certificate from These instructions were tested with a document signing certificate installed in slot 1a of a YubiKey FIPS, in Acrobat Reader 2019.021.20056, on Windows » Continue Reading.

Use Your YubiKey for S/MIME Email in Thunderbird

Mozilla Thunderbird users may have noticed that S/MIME certificates installed on a YubiKey hardware token are not immediately available for use in Thunderbird. Even though the YubiKey’s smart card features are supported by the underlying OS on both Windows and macOS, Thunderbird requires an additional » Continue Reading. Joins Adobe Approved Trust List (AATL)

Digitally Certify and Sign PDFs, a public certificate authority (CA) and voting member of the CA/Browser forum, is pleased to announce that it has been added to the Adobe Approved Trust List (AATL). The AATL is comprised of CAs that meet Adobe’s stringent assurance » Continue Reading.

Install an S/MIME Certificate on your YubiKey’s document signing and client authentication certificates are delivered on a secure YubiKey FIPS USB hardware token. To protect our customers’ information against the possible loss of their YubiKey, these certificates offer email signing but cannot be used for encryption or decryption. However, your certificate » Continue Reading.