Nec Corporation

Sebastien Andreina

Ghassan Karame

Wenting Li

Jens-Matthias Bohli

Giorgia Azzurra Marson

A method for registering a mining computing entity (MCE) with a trusted execution environment entity (TEEE) in a blockchain of a distributed blockchain consensus network (DBCN), based on a proof-of-stake protocol, includes providing public signing and corresponding secret signing information and trusted time information by the TEEE of the MCE, providing public and secret account information for a virtual wallet of the blockchain by the MCE, and generating integrity information by the TEEE. The method further includes generating attestation information by signing the integrity information, hashed public signing information and public account information, computing proving information, by an attestation providing entity (APE), by attesting the attestation information, and sending a transaction to the blockchain, signed with the secret account information, the transaction including the public signing information and the proving information.

Method for signing a new block in a decentralized blockchain consensus network

A method of generating a deniable commitment of personal data of a user with an unlinkable proof of the commitment of the personal data for securing user privacy in a digital identity system includes receiving the personal data of the user and receiving the commitment of the personal data according to a commitment scheme. An interactive zero-knowledge proof is engaged in with the user so as to verify that the commitment of the personal data opens to the personal data of the user.

Efficient deniable commitment of data and unlinkable proof of commitment for securing user privacy in a digital identity system

A method for securely sharing validation information of one or more data files stored on different cloud servers using distributed ledger technology includes requesting access to the data files and calculating a hash thereof. A structured Merkle tree is constructed using the hash and additional hashes of other data files for which a user has not granted access, but has used to construct a corresponding Merkle tree for which the user has committed a root value to a main blockchain. It is checked whether the root value of the Merkle tree is the same as the one the user has committed, and whether the hash of the data files is stored in a block of a satellite blockchain linked to the main blockchain and operated by a subset of nodes of the main blockchain that trust one another.

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Meyrin, Switzerland

Sebastien Andreina