A computer-implemented method, computerized apparatus and computer program product for supporting fairness in secure computations. A trusted execution platform with remote attestation (enclave) is provided to each of a plurality of participants. An authenticated public ledger accessible by all participants is also provided. Each of the enclaves is configured for obtaining at least a portion of an input to a function for computing a joint secret output, complementing the input by obtaining any remainder portion(s) thereof from one or more other enclaves, and, responsive to obtaining an indication from the ledger that the output can be computed by each of the enclaves, providing to the owner participant the output computed using the function and input. At least one of the enclaves is further configured for providing the indication to the ledger responsive to obtaining knowledge that the output can be computed by each of the enclaves.

A computation device accepts a first processing request output from a first external device, executes first processing, which does not involve outputting information to a second external device, of processing based on the first processing request until the first processing request is judged to satisfy a predetermined security level, and executes second processing, which involves outputting information to the second external device, of the processing based on the processing request after the first processing request is judged to satisfy the security level.

Data storage nodes that participate in a requested data statistical analysis as participant data storage nodes are determined and divided into a plurality of node sets. Data stored in each participant data storage node associated with a particular node set is encrypted, where the encrypted data is divided into a number of fragments at least equal to a number of participant data storage nodes associated with the particular node set. Each participant data storage node sends a portion of the encrypted data to each of the other participant data storage nodes within the particular node set. Each participant data storage node processes received encrypted data and data remaining on the particular participant data storage node to obtain a processing result. Each participant data storage node sends the processing result to a proxy node, wherein the proxy node performs data statistical analysis based on the processing result.

An authentication system is provided with: a user device; user side assistance device(s) to assist user authentication that authenticates a user of the user device, and apparatus authentication that authenticates the user device; and an apparatus authentication server device to perform apparatus authentication in association with the user device. The user side assistance device(s) use distributed shares of verification information to perform multi-party computation for user authentication in association with the user device, and use distributed shares of a secret key generated by the user device, to perform multi-party computation for apparatus authentication in association with the user device.

A method of obtaining a shared prediction model is provided. The method includes: obtaining a prediction model as a neural network; converting each negative numerical value in a plurality of parameters included in the prediction model to a positive numerical value to obtain a converted prediction model; and sharing the converted prediction model by a secret sharing method to obtain shared prediction models while concealing an input data.

Computer-implemented systems and methods are disclosed herein for use within secure multi-party computation. A system and method are used for storing an operation preference and a cryptographic preference. A data set is stored based on the operation preference and the cryptographic preference. A determination is made that processing the query involves performing an allowable operation on the data set based on the operation preference.

The invention relates to a method for aggregation of a performance indicator of a device comprising the steps of: concatenating a respective first data item to a plurality of second data items in the device; encrypting the plurality of concatenated second data items relevant for computing the performance indicator using a first encryption key in the device, wherein the first encryption key is based on an additive homomorphic encryption scheme; sending the encrypted concatenated second data items to a computation cluster; computing the performance indicator on the computation cluster using the encrypted concatenated second data items and computing an aggregate value regarding the performance indicator by summing up the encrypted concatenated second data items; sending the aggregate value to a server of a service provider of the device; decrypting the aggregate value using a second encryption key on the server of the service provider; and verifying the decrypted result by checking whether the decrypted sum computed by summing up the encrypted concatenated second data items comprises a predetermined value. The present invention also relates to a corresponding system and corresponding computer program product comprising one or more computer readable media having computer executable instructions for performing the steps of the method.

A system for authenticating a user accessing a device includes an authentication server and a ticket granting server. The authentication server is configured to generate a part of an authentication ticket which is combinable with at least one other part generated by at least one other authentication server to produce a complete authentication ticket, and to generate a part of a user session key which is combinable with at least one other part generated by the at least one other authentication server to produce a combined user session key. The ticket granting server is configured to authenticate the user by collaboratively, with at least one other ticket granting server, decrypting user request information using the combined user session key and comparing content of the decrypted user request information with the complete authentication ticket.

Standardized digital signature schemes (e.g., Rivest-Shamir-Adleman (RSA), Digital Signature Algorithm (DSA), Elliptical Curve Digital Signature Algorithm (EC-DSA), etc.) may be employed to prove authenticity of a message containing credentials. Proving possession of valid credentials may be performed using a combination of garbled circuits with message authentication codes (MACs) and proof of knowledge protocols (e.g., Sigma protocol, Schnorr protocol, etc.). Such techniques may allow proving entities to prove possession of valid credentials using standardized signature schemes without revealing those credentials directly to a verifying entity.

This invention pertains to secure communications between multiple parties and/or secure computation or data transmission between multiple computers or multiple vehicles. This invention provides a secure method for three or more parties to establish one or more shared secrets between all parties. In some embodiments, there are less than 40 parties and in other embodiments there are more than 1 million parties that establish a shared secret. In some embodiments, establishing a shared secret among multiple parties provides a method for a secure conference call. In some embodiments, a shared secret is established with multiple computer nodes across the whole earth to help provide a secure Internet infrastructure that can reliably and securely route Internet traffic. In some embodiments, a shared secret is established so that self-driving vehicles may securely communicate and securely coordinate their motion to avoid collisions. In some embodiments, a shared secret is established with multiple computer nodes that participate as a network, performing blockchain computations.