Adding PKCS#11 module

Hello ​@Admirable_practice43f8 

I hope you are doing well, and thanks for reaching out. Sorry for the trouble you had.

Could you please share more details about the issue? 

• What Adobe product is this in: Acrobat Reader, Acrobat Standard, or Acrobat Pro? What is the version installed? Check from Menu (Windows) | Acrobat (Mac) > Help> About Adobe Acrobat.
• What operating system and exact Acrobat version/build are they using?
• Which PKCS#11 token/smart card or middleware are you trying to attach, and is the required PKCS#11 library already installed? And what is the token brand? 
• Is the Attach Module visible but greyed out immediately, or does it become disabled only after selecting a particular security-device option?

Please ensure you have the latest version of Acrobat installed on the machine: 26.002.21869, Planned update, Aug 31, 2026. Check for any pending updates from Menu >Help > Check for updates, install any pending updates, restart the app, and the computer. And try again.

• In Acrobat/Reader, go to Acrobat Reader menu > Preferences > Security (Enhanced).
• Untick "Enable Protected Mode at startup". Click OK.
• Fully quit the app, not just close the window, then reopen it.
• Go back to Preferences > Signatures > Identities & Trusted Certificates > (More) > PKCS#11 Modules and Tokens. The Attach Module button should now be active, and you can point it at your token vendor's .dylib module.

If you are on a Mac machine (Apple Silicon (M-series)), then right-click the app in Applications > Get Info > tick "Open using Rosetta", then relaunch.

Once your module is attached and working, it is worth re-enabling Protected Mode afterwards for security, or, better, trusting just your token's needs rather than leaving the sandbox off long-term.

Please check these articles for more information:

https://helpx.adobe.com/acrobat/desktop/protect-documents/manage-digital-ids/register-ids.html

https://www.adobe.com/devnet-docs/acrobatetk/tools/PrefRef/Windows/Security.html#pkcs-11-configuration

https://helpx.adobe.com/acrobat/kb/protected-mode-troubleshooting.html

I hope this helps, and please reach out if you experience any issues, or need any assistance.

Regards,

Anand Sri.

Hi @Piotr_KRK,

Hope you are doing well. Sorry for the trouble with Acrobat.

We released an update to the application which has significant performance and stability enhancements.

Would you mind letting us know if the workflow works with the latest version (2025.001.20458)?

If not, please share a few pieces of information for further investigation:

1. The OS details of your device;

2. Please help us gather logs from your machine: https://adobe.ly/4l1gBRA. Please make sure Procmon is selected. You can upload logs using this tool and share your Unique log ID with us.