Digital signatures are binary data that humans cannot directly read and interpret. You need programs for this.
Any program that can be used to sign can also verify the signature. However, modern signature systems are largely standardized (either according to the X.509v3 standard or according to the PGP standard). This means that the recipient of a signed file does not necessarily need the same program that was used to sign it.
Which test program can be used depends both on the signature method used and on the signed file type.
For the most common combination, the advanced signature procedure A-CERT ADVANCED and the document type “.pdf”, the free Adobe Reader program from version 6.0 is sufficient for checking
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