The present invention relates to a data carrier (1) having a security mark (2) in which a code is embedded, which security mark is of an optical type. For instance, the mark is of the POWF (Physical One Way Functions) type which gives a speckle pattern for a specific light. From this speckle pattern it is possible to determine a code from which it is possible to get an authentication mark or a decrypting key. In an alternative, it is possible to use a hologram from which a key or authentication mark can be derived by using a unique spatial modulation filter at the level of the analysis of the security mark.
|Publication status||Published - 26 May 2005|