An inner-product functional encryption scheme in which the maximum length of a ciphertext and the maximum length of a secret key are not restricted can be constructed. An encryption device (20) generates a ciphertext ct.sub.x in which a vector x is encrypted, using encryption setting information that is of a size depending on the size of the vector x and is generated using as input public information of a fixed size. A key generation device (30) generates a secret key sk.sub.y in which a vector y is set, using key setting information that is of a size depending on the size of the vector y and is generated using as input the public information. A decryption device (40) decrypts the ciphertext ct.sub.x with the secret key sk.sub.y to calculate an inner-product value of the vector x and the vector y.

The application relates to a method for operating a scanning system with a scan server arrangement and a scanning device that can be connected to the scan server arrangement. The scanning system is configured to obtain a scan job encrypted with a public scan job key from a scanning device and to receive a private scan job key encrypted with a public computer device key from a mobile user terminal. The received encrypted private scan job key is subsequently sent to the computer device for further processing.

A function executing device may cause a first output unit to output first output information including location information of a server that is configured to operate according to a predetermined authentication scheme. The first output information may be acquired by a terminal device configured to operate according to the predetermined authentication scheme. The terminal device may be configured to access the server, receive first verification information, create signature information by encrypting the first verification information using a private key in a case where first authentication for a target user succeeds, and send the signature information to the server. The server may be configured to decrypt the signature information using a public key, and send an execution instruction to the function executing device in a case where the first verification information is acquired by decrypting the signature information. The function executing device may execute a specific function.

Methods, systems, and devices for wireless communications are described. A user equipment (UE) may receive a system parameter identified by a network entity (e.g., a public key generator (PKG)), and receive a cell identifier during a connection procedure between the UE and a base station in wireless communication with the UE. The cell identifier may be associated with the base station. The UE may encrypt at least a portion of a message associated with the connection procedure using the cell identifier and the system parameter. In some examples, the portion of the message may include private information. The UE may transmit the message to the base station as part of the connection procedure.

A method including determining, by a first user device, a sharing encryption key based at least in part on a folder access private key associated with a folder and an assigned public key associated with a second user device; encrypting the folder access private key associated with the folder utilizing the sharing encryption key; and transmitting the encrypted folder access private key to enable the second user device to access the folder. Various other aspects are contemplated.

A method including determining, by a processor, an assigned key pair associated with a user device, the assigned key pair including an assigned public key and an assigned private key; authenticating, by the processor, received biometric information; selectively transmitting, by the processor to a trusted device based at least in part on a result of authenticating the received biometric information, an encryption request to encrypt the assigned private key; and encrypting, by the processor based at least in part on selectively transmitting the encryption request, content based at least in part on utilizing the assigned public key is disclosed. Various other aspects are contemplated.

The techniques described herein provide for authentication of a reader device over a wireless protocol (e.g., NFC or Bluetooth, BLE). The mobile device can receive and store the static public key of the reader device and one or more credentials, each credential specifying access to an electronic lock. The mobile device can receive an ephemeral reader public key, a reader identifier, and a transaction identifier. The mobile device can generate session key using the ephemeral mobile private key and the ephemeral reader public key and send the ephemeral mobile public key to the reader device. The reader device can receive the ephemeral mobile public key and sign and transmit a signature message to the mobile device. The mobile device can validate a reader signature and generate an encrypted credential that the reader can use to access an electronic lock. The reader device can authenticate the mobile device for mutual authentication.

A method for byzantine fault-tolerance replicating of data on a plurality of n servers includes performing a preprocessing procedure. The n servers include one primary node (PN) and n−1 backup nodes (BN), wherein f servers may arbitrarily fail, and wherein all n servers have a trusted computing entity (TCE). The preprocessing procedure is performed by the TCE of the PN and includes computing a random secret value for a unique, monotonic, sequential counter (UMSC) to be assigned with a request message for requesting an operation to be performed, computing a commitment for the random secret value and the UMSC, and splitting the random secret value into a plurality of shares. The preprocessing procedure further includes computing a server-specific authenticated encryption of each share, and providing the computed server-specific shares and the computed commitment to the respective servers.

A high-performance distributed ledger and transaction computing network fabric over which large numbers of transactions (involving the transformation, conversion or transfer of information or value) are processed concurrently in a scalable, reliable, secure and efficient manner. In one embodiment, the computing network fabric or “core” is configured to support a distributed blockchain network that organizes data in a manner that allows communication, processing and storage of blocks of the chain to be performed concurrently, with little synchronization, at very high performance and low latency, even when the transactions themselves originate from distant sources. This data organization relies on segmenting a transaction space within autonomous but cooperating computing nodes that are configured as a processing mesh. Each computing node typically is functionally-equivalent to all other nodes in the core. The nodes operate on blocks independently from one another while still maintaining a consistent and logically-complete view of the blockchain as a whole. According to another feature, secure transaction processing is facilitated by storing cryptographic key materials in secure and trusted computing environments associated with the computing nodes to facilitate construction mining proofs during the validation of a block.

Generally discussed herein are devices, systems, and methods for binding with cryptographic key attestation. A method can include generating, by hardware of a device, a device public key and a device private key, based on the device private key, signing a first attestation resulting in a signed first attestation, the first attestation claiming the device private key originated from the hardware, based on the device public key and the signed first attestation, registering the device with a trusted authority, generating, by the hardware, a first application private key and a first application public key, and based on the device private key, signing a second attestation resulting in a signed second attestation, the second attestation claiming the first application private key originated from the hardware, and based on the first application public key and the signed second attestation, registering a first application of the device to a first server.