摘要:
This invention provides a technique of preventing determination of image alteration when digital image data has undergone, e.g., rotation without any substantial change in contents. To do this, an area separation processing unit separates image data into areas. For each of the separated areas, an area feature value calculator calculates an area feature value independent of the coordinate information of the image. An area order sorter sorts the separated areas in accordance with the calculated area feature values. A validation data generation processing unit generates validation data based on the sort result.
摘要:
This invention provides a technique of preventing determination of image alteration when digital image data has undergone, e.g., rotation without any substantial change in contents. To do this, an area separation processing unit separates image data into areas. For each of the separated areas, an area feature value calculator calculates an area feature value independent of the coordinate information of the image. An area order sorter sorts the separated areas in accordance with the calculated area feature values. A validation data generation processing unit generates validation data based on the sort result.
摘要:
A data sharing apparatus shares first data with a communication partner. The data sharing apparatus obtains second data from third data by using server-aided computation, and generates fourth data to be used by the communication partner for obtaining the first data, from the second data and fifth data. The data sharing apparatus obtains the first data to be shared with the communication partner by using server-aided computation from sixth data generated from the third data and seventh data.
摘要:
An image input device which includes a means for inputting image data, a memory for storing a secret information and an operator for carrying out an operation by using the image data and the secret information.
摘要:
An image input device which includes a means for inputting image data, a memory for storing a secret information and an operator for carrying out an operation by using the image data and the secret information.
摘要:
A data sharing apparatus shares first data with a communication partner. The data sharing apparatus obtains second data from third data by using server-aided computation, and generates fourth data to be used by the communication partner for obtaining the first data, from the second data and fifth data. The data sharing apparatus obtains the first data to be shared with the communication partner by using server-aided computation from sixth data generated from the third data and seventh data.
摘要:
A system for enabling verified or verifiable communications while maintaining anonymity, in which a common public parameter, such as a prime number, and a registered signature are changed, respectively, by a specifier and a signer to provide a digital signature which accompanies a message sent from the signer to a verifier.
摘要:
An image input device which includes a means for inputting image data, a memory for storing secret information and an operator for carrying out an operation by using the image data and the secret information.
摘要:
An initiator shares y_ir with a responder, calculates HASH_I on the basis of y_ir, and sends HASH_I to an IKE proxy server. The initiator receives a digital signature SIG_S generated for HASH_I and the address of the initiator from the IKE proxy server and sends the digital signature SIG_S to the responder.
摘要:
An image communication apparatus converts image data received through a communication line into bit image data to be reproduced as a visible image by means of using a data converting unit and a reproducing unit. The apparatus converts data from a data processing apparatus into bit image data to be reproduced as a visible image by means of using the data converting unit and the reproducing unit, so as to accomplish an efficient system as a whole.