Problems of Forensic Sciences 2001 Vol. 46 (XLVI) 375-382
TRACES OF FORGERY IN DIGITALLY MANIPULATED DOCUMENTS
Audrys DERINGAS
Institute of Forensic Examination, Vilnius, Lithuania
Streszczenie
Criminals use modern technology for producing counterfeit documents. The counterfeit system (scanner, computer, printer) can be successfully used by criminals for the production of banknotes, invoices, contracts, diplomas, etc. In the process of production of these documents the graphic programmes are often used for changing some details such as signatures, seal impressions, numbers and other important information. Law enforcement agencies are often interested in not only if the document is counterfeited, but in the identification of the source document. This is more difficult when the counterfeit has changes made by graphic programmes, as these programs can alter the document to an almost unrecognisable state. The paper focuses on the possibilities to detect the traces of alterations made by graphic programmes in questioned documents. The report is illustrated with pictures from case work.
Słowa kluczowe
Questioned documents; Digital images.