Search for encrypted text in QR-code signatures

GroupDocs.Signature provides ability to search over secure QR-code signature (QrCodeSignature) with standard or custom encryption. Standard encryption is implemented over class SymmetricEncryption class. Creation of this object expects 3 arguments like encryption algorithm enumeration SymmetricAlgorithmType with one of following values (DES, TripleDES, RC2, Rijndael), string value key and string value salt.

Here are the steps to search for secure QR-code text with standard encryption with GroupDocs.Signature:

This example shows how to search for secure QR-code signature text.

Signature signature = new Signature("QRCodeEncryptedText.pdf");
// setup key and passphrase
String key = "1234567890";
String salt = "1234567890";
// create data encryption
IDataEncryption encryption = new SymmetricEncryption(SymmetricAlgorithmType.Rijndael, key, salt);
QrCodeSearchOptions options = new QrCodeSearchOptions();
// specify special pages to search on
PagesSetup pagesSetup = new PagesSetup();
// specify types of QR code to verify
// search for signatures in document
List<QrCodeSignature> signatures =,options);
System.out.print("\nSource document contains following signatures:");
for (QrCodeSignature qrCodeSignature : signatures)
    System.out.print("QRCode signature found at page "+qrCodeSignature.getPageNumber()+" with type "+qrCodeSignature.getEncodeType().getTypeName()+" and text "+ qrCodeSignature.getText());

More resources

GitHub Examples 

You may easily run the code above and see the feature in action in our GitHub examples:

Free Online App 

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.