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  1. Solving the error BER decoding with digital signature using a certificate on a smart card

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    1 comment  ·  Acrobat Reader for Windows and Mac » Sign  ·  Admin →
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    David Najman commented  · 

    If it is on a Mac OSm check this:
    If you're experiencing issues with applications like Adobe Acrobat Reader not being able to access your digital signature certificate's private key stored in Keychain Access, or if you simply want an extra layer of security, you might need to adjust its access control settings. Specifically, enabling "Confirm before allowing" ensures that macOS will prompt you for confirmation every time an application attempts to use that private key.

    Here's a step-by-step guide:

    Open Keychain Access (Applications > Utilities > Keychain Access).
    Find your private key (the key icon) for e.g. the PostSignum certificate.
    Right-click on it and select "Get Info".
    Go to the "Access Control" tab.
    Check the box for "Confirm before allowing".
    Click "Save Changes".
    That's it! Now, macOS will prompt you for confirmation every time the key is accessed.