Academics from Ruhr University Bochum have proven that the majority of popular PDF viewer apps and online digital signature validation services can be tricked into validating invalid signatures or validating signatures on documents that have been modified after having been signed. Digitally signed PDF documents are accepted and provided by governmental authorities, are admissible in court, can be used for tax reporting, signing scientific papers, official business documents, and more.

Read full news article on Help Net Security