Okular has recently gotten improved support for verifying cryptographic signatures in PDF files. https://tsdgeos.blogspot.com/2022/03/okular-signature-support-

Okular has recently gotten improved support for verifying cryptographic signatures in PDF files. https://tsdgeos.blogspot.com/2022/03/okular-signature-support-now-works-on.html https://tsdgeos.blogspot.com/2022/03/okular-signature-suppor...