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| Data encryption | This uses a symmetric or asymmetric encryption method and is able to protect sensitive data. |
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| DDA | Dynamic Data Authentication: a highly secure authentication technology that allows banks to approve transactions more securely at the terminal. |
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| DES | Data Encryption Standard |
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| Document Adviser | A border control officer of a country who in the pre-frontier area of, for example, an airport, advises on the authenticity of the ID documents presented by flight passengers, by instructing airline check-in staff on what documents will be accepted on arrival at the destination airport. Background: If an airline flies a passenger with forged papers into a country, the airline is obliged to return this passenger to the airport of departure at its own expense. |
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| Document Database | An electronic collection of images showing travel documents from different countries, including the security features for manual or automated authentication of a document at the border. |
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| Document Reader | An electronic device which reads the personal data on a Machine Readable Travel Document and displays it on a computer screen for further analysis. We distinguish MRZ and full-page readers. Devices for reading the RFID chip in electronic documents will become increasingly important in future. |
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| DTX | Also known as decitex, dezitex or dtex. This is the measuring unit for thread and is the weight in grams of a 10,000m fibre. For example, with a value of 50 dtx, 10,000m of thread weighs 50g. |
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