

Use this to expand and reveal PKCS#11 PIV Library (SP-800-73), then select it. After attaching the module, you should see a > symbol next to PKCS#11 Modules and Tokens.Browse to C:\Program Files (x86)\Yubico\Yubico PIV Tool\bin (32-bit) or C:\Program Files\Yubico\Yubico PIV Tool\bin (64-bit) and select libykcs11.dll.Navigate to Signatures > Identities & Trusted Certificates > More > PKCS#11 Modules and Tokens and click Attach Module.If you have to uncheck this, you may be prompted to restart Acrobat, in which case you should do so immediately, then reopen Edit > Preferences.Since Acrobat cannot interact with smart cards in Protected Mode (see attached screenshot), make sure Enable Protected Mode at startup is unchecked under Security (Advanced).Open Acrobat, and navigate to Edit > Preferences.If it is under C:\Program Files, then it is 64-bit, and if C:\Program Files (x86), 32-bit. If you’re not sure whether your Adobe software is 32 or 64-bit, check its installation directory.Install the 32 or 64-bit version of the Yubico PIV Tool, depending on whether your Adobe software is 32 or 64-bit (YPT installers available here ), then follow the instructions on under YKCS11 on Windows.


Make sure your YubiKey is inserted, and has your signing certificate imported into slot 9c (this is the slot for digital signature).To set your YubiKey up for digital signature with Adobe Acrobat Reader, follow the instructions below.
