Patent ID: 7933406
Filing Date: 2011-04-26
Classification: H04L,H04N

Abstract:
1. An encryption device that encrypts information formed on a recording member on the basis of an encryption code, the device comprising: an irradiation portion configured to irradiate a surface of the recording member with laser light, the laser light emitted from the irradiation portion being reflected by irregularities in the irradiated surface of the recording member to produce scattering light of which waves are interfered with each other; an image taking portion configured to receive the produced scattering light to take a speckle pattern image of the irradiated surface of the recording member irradiated with the laser light; and a preparation portion configured to prepare the encryption code on the basis of the taken speckle pattern image of the irradiated surface with respect to the recording member; wherein the information is constituted by a sequence of characters including at least one character, wherein the device further comprises: