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| CAC | Common Access Card: a US Department of Defense smart card issued as standard physical and network identification for military and other personnel |
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| CDMA | Code Division Multiple Access: a wireless communications technology that uses the spread spectrum communication to provide increased bandwidth. |
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| Checksum | A checksum is a feature that warrants data integrity when saving data. In order to obtain a checksum, the basic components of a message are multiplied by a certain factor and then added up in sequence. The resultant value is then saved as the checksum. When reading the ?copy? of the data, a checksum of this can also be calculated and compared with the saved checksum of the original file. If the two checksums differ, this indicates that there is a saving error and saving must be repeated. If both checksums are identical, the data has been correctly transferred. |
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| Chip inlay | Comprises the chip, the chip module and the antenna and is integrated into the cover or one of the pages of the passport booklet. |
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| CLI | Changeable Laser Image |
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| Contactless | A card that communicates by means of a radio frequency signal, eliminating the need for physical contact between the card and a reader. |
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| Contactless card | A card that can be read from a distance instead of being swiped through or inserted into a card reader. |
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| Counterfeit | Illegal copying of an ID document or other products. |
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| Country Signing Certificate (CSC) | A certificate issued by the Country Signing Certification Authority (CSCA) and used to certify the chip in sovereign documents of this country. The CSC is part of a Public Key Infrastructure (PKI). |
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| Crew Member Licence | This is issued by an airline to employees to confirm employment as a member of an airline crew. It is valid only when presented together with a personal ID document, and allows the holder to enter a country without a visa and stay in a community adjacent to the airport. |
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| Cryptography | The process of turning readable text into cipher text and back again. |
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