A-Trust verification tool for digitally signed documents

Digital signatures ensure that the data provided is authentic. The content of the document is converted into a hash value and signed cryptographically using a private key (the hash value is like a file fingerprint). A certificate is attached to the document for the purpose of signature verification. At A-Trust, you can check signature validity. This will tell you who signed (and when exactly), whether the content of the document has been modified and whether signature and certificate are valid.