Abstract: A conversion device for secure computation for converting an input data which is an object data of secure computation into an input format applicable to the secure computation is provided. A conversion device for secure computation of the present invention includes an acquisition unit configured to acquire an object data of the secure computation; a storage unit configured to store a correspondence table specifying an input format required for executing the secure computation; a conversion processing unit configured to perform a conversion from the acquired object data into a secure computation data in accordance with the correspondence table; and an output unit configured to output the secure computation data.

Abstract: Provided with a technology of a machine learning using a convolutional neural network depending on practical calculation cost and security level desired by a user.

Abstract: An information processing system capable of processing the encrypted data efficiently is provided. The information processing system of the present invention includes: a key management unit configured to manage a system key; a storage unit configured to store an encryption data encrypted by the system key; and a processing execution unit configured to temporarily construct a virtual execution environment protected from a standard execution environment and decrypt the encryption data in the virtual execution environment based on the system key acquired from the key management unit.

Abstract: Provided with a calculation device for performing a calculation for an encryption data in a virtual execution environment protected from a standard execution environment, the calculation device has a virtual execution environment construction unit for constructing the virtual execution environment, and the virtual execution environment includes: an encryption data acquisition unit for acquiring the encryption data; a source code acquisition unit for acquiring a source code for the calculation; a key acquisition unit for acquiring the system key; a decryption unit for decrypting the encryption data by the acquired system key; a source code execution unit for executing the source code; an encryption unit for encrypting a calculation result to which the source code is executed by the system key; and a calculation result providing unit for providing the encrypted calculation result to the standard execution environment.