Genuine or Fake

Stereomicroscopy Exposes Counterfeiters

August 31, 2011

ID cards, driving licenses, birth certificates, A-level exams – the potential for individual perpetrators or gangs to gain advantages by forging documents is vast. And the more sophisticated the security standards, the better equipped experts have to be in order to clearly differentiate between genuine documents and fakes. In the forensic department of the Regional Council of Stuttgart, Germany, a high-end stereomicroscope is helping to track counterfeiters. Every year, more than 1,200 suspect documents are examined and assessed as a service for the regional police and public prosecutors.

When Martin Fischer arrives at his desk in the Regional Council of Stuttgart early in the morning, there are usually several suspicious ID cards already waiting for his trained eye. They have been confiscated by the police in their night checks for Fischer to examine their authenticity. A year ago, the Chief Detective Superintendant qualified as a certified expert on certificate forgeries, fulfilling a professional aim that is perfect for his technical bent.

Fig. 1: For Martin Fischer, expert appraiser for document examinations at the District Council of Stuttgart, the Leica M165 C stereomicroscope with LED illumination, HD camera and full-HD monitor is an indispensable tool for examining the authenticity of suspicious ID cards, visas and all kinds of documents.

Competent in all techniques

"Anything serving as a document, whether printed, signed or sealed on paper, plastic or metal – a car registration plate, for instance – that constitutes an authorization or that can be forged to gain advantages, can land on my desk", says Fischer. "To detect professional forgeries and to furnish watertight evidence for my appraisals, I have to keep up with the latest technology." He knows all the document production techniques from traditional printing to the RFID chip and the new security criteria for ID cards.

Fig. 2: A hologram inserted subsequently – the edges can be clearly seen under the microscope.

From standard to strange

ID cards and driving licenses from all over the world account for roughly 80 per cent of his work, followed by birth certificates and proof of nationality. But there are plenty of strange and exotic cases, as well. "I recently had a German certificate from a foreign Goethe Institute to examine. Another unusual assignment was to check whether A-level math exam papers had been corrected afterwards to raise the quota", Fischer recounts.

"But my strangest case to date was a Senegalese single status certificate – a long, narrow strip of paper with a sort of writing I had never seen before. Before I can make any kind of statement, I am faced with the challenge of finding out what a document of that type is supposed to look like."

Although there is a personal story behind many certificate forgeries, or the verdict on a defendant may depend on Fischer’s report, he always approaches cases with scientific rigor. "I don’t read the circumstances of the case until I have provided the results, so that I can carry out the examinations in a neutral and unbiased way", stresses the expert.

Fig. 3: The slightly impressed figures show that this is genuine relief printing.

Counterfeiters – creative and amateurish

Even experts like Fischer never fail to be amazed by the skilled and professional way counterfeiters operate today. ID cards and passports (as well as banknotes) are furnished with the highest security standards. Yet the more high-tech features an ID card has been given, the more the counterfeiters upgrade their equipment, and may even try to forge RFID chips, holograms and microtext or to imitate special printing techniques such as iris or intaglio printing or laser engraving. "Nevertheless", says Fischer, "counterfeiters never master all the security features equally well. They usually concentrate on a few particularly prominent features and put a lot of technology into attempts to perfectly reproduce them.

However, they then make amateurish mistakes with other features, and that makes it easier for me to catch them out. A common trick is to stick in holograms, chips or other components from genuine ID cards. These collages are not always easy to detect with the naked eye or by running a finger over them – depending on the skill of the counterfeiter."

Fig. 4: This serial number was applied with an ordinary inkjet printer – not clearly detectable with the naked eye.

The microscope – the most important tool

The first step in every new case is always to classify the document as authentic or fictitious. If Fischer does not recognize the type of document, he searches in databases for a reference sample. The second step is to check for obvious signs of manipulation. His trained eye and sense of touch detect major signs of manipulation immediately, for example if stamps have been rubbed out, numbers overwritten by hand or a new photo inserted in an amateurish way. This is followed by examination under a microscope. "I couldn’t do this job without a good microscope. Most cases are decided during the microscopic examination", Fischer says. He works with the high-performance stereomicroscope Leica M165 C which has a 16.5:1 zoom and features LED right light, flexible LED fiber optic guide, a mobile swivel arm, a high-definition camera and a full HD monitor.

Fig. 5: This laser engraving is genuine. The laser actually burns the structure into the material. Laser engravings are applied to plastics used for modern ID cards, for example.

3D image and LED illumination facilitate analysis

"The combination of good illumination and the 3D impression of the stereomicroscope are critically important for examining the finest details of the document’s surface structure. The details of better forgeries only show up under the microscope – for instance, attempts to imitate laser engraving, gravure or relief printing elements, or good collages where the chip, hologram or serial number, etc. have been added afterwards. There are always discrepancies somewhere – at the edges, the transitions of fine linear printing patterns, or the orientation of the paper fibers", Fischer explains.

Fig. 6: The raised ink can be clearly seen in this genuine gravure printing.

Looking for clues under the microscope

If only the photo has been exchanged, and this has been carefully done, typographic examinations or data readouts do not provide any useful information. The only way to find clues is under the microscope. Sometimes, Fischer bends the ID card over the edge of the table to look under the edge of the photo that has been stuck in. If he finds torn fibers on the side of the ID card that do not correspond to the back of the photo, the case is clear.

"A false photo is still the most common way of manipulating ID cards", says Fischer. "With good forgeries it’s not always easy to find the clues. This is where I use the highest magnifications of the microscope. For basic examinations, the low zoom range between 20 and 30x is usually adequate."

Apart from the microscope, Fischer also uses other instruments, e.g. to examine certain security features,  inks or stamp dyes under UV or IR light or to read out the personal data of the chip.

At the end of every examination, Fischer documents his results. His appraisal also includes the photos of the microscope images with thorough annotations. "I naturally take care to formulate the report in such a way that there are no outstanding issues", Fischer stresses. "I am rarely summoned to attend court proceedings to explain my reasons for an appraisal."

Fig. 7a: On the left and underneath the photo, a manually applied cutting edge can be seen. Here, the authentic security foil has been cut open and the original photo removed. The counterfeiter then inserted a different photo inside these cutting edges and covered everything with laminated foil.
Fig 7b: A microtool is used to raise this “alien foil” at one corner of the ID card.
Fig 7c: The security pattern print under the photo is missing – in this case the yellowish lettering. Here the paper of the ID card was damaged when the original photo was removed.

The Idea of Forging Documents…

… is no doubt nearly as old as the use of official documents and contracts. Even the history of Europe might have taken a different course had it not been for the famous Donation of Constantine, forged around the year 800, which gave the Church of Rome and the Pope authority over all other local churches and a secular claim to power equivalent to that of the emperor. The Vatican used this certificate to particular effect in the Middle Ages to defend itself against imperial paternalism.

It was not until 600 years later that it was proved that this certificate, allegedly issued by Constantine I in the 4th century, could not be authentic. Nowadays, forgeries of this scale would be impossible. However, the temptation to gain advantages by false or manipulated documents is still strong enough to keep the police force and the courts extremely busy pursuing crimes of this kind.

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