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1. 发明申请

WO2022078632A1 METHOD AND SYSTEM FOR SUPPORTING SMART CONTRACTS IN A BLOCKCHAIN NETWORK 审中-公开
公开(公告)号：WO2022078632A1
公开(公告)日：2022-04-21
申请号：PCT/EP2021/054838
申请日：2021-02-26
申请人： NEC LABORATORIES EUROPE GMBH
发明人： GIESEN, Jens-rene , RODLER, Michael , DAVI, Lucas , ANDREINA, Sébastien , KARAME, Ghassan
IPC分类号： G06F21/57 , G06F21/56 , G06F21/64
摘要： A computer-implemented method for supporting smart contracts in a blockchain network, the method comprising: translating a source code of a smart contract into an abstract syntax tree model; generating a code property graph based on the abstract syntax tree model; performing an enrichment phase, wherein the code property graph is enriched with information that is inferable from the abstract syntax tree model; performing a vulnerability detection phase, wherein the code property graph is checked for one or more predetermined vulnerability patterns in order to find one or more predetermined vulnerabilities; and performing a vulnerability patching phase, wherein one or more patches are applied in order to fix vulnerabilities found in the vulnerability detection phase, wherein the patches are inserted into the code property graph such that a patched code property graph is generated. Furthermore, a corresponding computer system for supporting smart contracts in a blockchain network is disclosed.

2. 发明申请

WO2022063420A1 METHOD AND DISTRIBUTED LEDGER SYSTEM FOR SUPPORTING SHARING OF DIGITAL HEALTH DATA OF TRAVELERS IN A TRAVEL ENVIRONMENT 审中-公开
公开(公告)号：WO2022063420A1
公开(公告)日：2022-03-31
申请号：PCT/EP2020/086287
申请日：2020-12-15
申请人： NEC LABORATORIES EUROPE GMBH
发明人： ANDREINA, Sébastien , BOBBA, Rahul , KARAME, Ghassan
IPC分类号： G06Q10/00 , G06Q50/14 , G06Q50/26 , G06Q50/30 , H04L9/32
摘要： A method for supporting sharing of digital health data of travelers in a travel environment, wherein the travelers' identity is managed using a distributed ledger system, wherein the distributed ledger system includes a global identity blockchain, several security blockchains and a health blockchain, the method comprising: Sending, from a security blockchain to a traveler, a request to share a predetermined number of health data records; Receiving, by the security blockchain, consecutive access keys for the requested health data records and a zero knowledge proof from the traveler; Verifying, by the security blockchain, the zero knowledge proof received from the traveler, wherein the zero knowledge proof is utilized to validate a latest access key of the access keys provided by the traveler; Upon successful verification of the zero knowledge proof, retrieving, by the security blockchain, the health data records from the health blockchain based on hashed access keys, wherein the hashed access keys are generated from the access keys provided by the traveler; Verifying, by the security blockchain, access keys provided by the traveler using hashed previous access keys included in the retrieved health data records, in order to check whether the traveler has provided the access keys required for the health data records as requested. Furthermore, a corresponding distributed ledger system is disclosed.

3. 发明申请

WO2021190740A1 BOOTSTRAPPING ROOT OF TRUST FOR FEDERATED BLOCKCHAINS 审中-公开
公开(公告)号：WO2021190740A1
公开(公告)日：2021-09-30
申请号：PCT/EP2020/058259
申请日：2020-03-25
申请人： NEC LABORATORIES EUROPE GMBH
发明人： KARAME, Ghassan , ANDREINA, Sébastien , LI, Wenting
IPC分类号： H04L29/06 , H04L9/32 , H04L63/123 , H04L9/3239
摘要： Disclosed are methods and systems for supporting trusted communication between nodes (3) from different blockchains (4). The method comprises using a bootstrapping service (1) for bootstrapping trust among blockchains (4) of a group of federated blockchains (4), wherein the bootstrapping service (1) records security parameters of the federated blockchains (4). The security parameters include information on the consensus configurations of the federated blockchains (4).

4. 发明申请

WO2021175409A1 METHOD FOR SUPPORTING SHARING OF TRAVEL HISTORY OF TRAVELERS IN AIRPORTS 审中-公开
公开(公告)号：WO2021175409A1
公开(公告)日：2021-09-10
申请号：PCT/EP2020/055478
申请日：2020-03-02
申请人： NEC LABORATORIES EUROPE GMBH
发明人： ANDREINA, Sébastien , KARAME, Ghassan
IPC分类号： H04L9/32 , G06F21/64 , H04L29/06
摘要： A method for supporting sharing of travel history of travelers in airports, wherein the travelers' identity is managed using a distributed ledger system, wherein the distributed ledger system includes a global identity blockchain and several per segment security blockchains, wherein the global identity blockchain is accessible by entities of the distributed ledger system, and wherein a per segment security blockchain is employed for a predetermined flight segment, such that the per segment security blockchain is accessible only by entities of the distributed ledger system that are involved in the predetermined flight segment, the method comprising: receiving, bya trusted entity of said distributed ledger system, a registration request from a traveler via a traveler application, wherein the registration request provides personal information of the traveler to the trusted entity; generating, by the trusted entity, a public key for the traveler using an identity-based encryption mechanism, wherein said public key is based on the personal information of the traveler; sending,from the trusted entity tothe global identity blockchain, a registration transaction with respect to the traveler, wherein the registration transaction comprises the public key of the traveler in order to be registered in the global identity blockchain; recording a travel history that includes all travel tickets of the traveler, wherein a Merkle tree of all the travel tickets of the traveler is generated, wherein the Merkle tree has a Merkle root, and wherein the Merkle root of the Merkle tree is stored in the global identity blockchain.

5. 发明申请

WO2019179829A1 SYSTEM AND METHOD FOR SECURE TRANSACTION VERIFICATION IN A DISTRIBUTED LEDGER SYSTEM 审中-公开
公开(公告)号：WO2019179829A1
公开(公告)日：2019-09-26
申请号：PCT/EP2019/056188
申请日：2019-03-12
申请人： NEC LABORATORIES EUROPE GMBH
发明人： KARAME, Ghassan , BOHLI, Jens-Matthias
IPC分类号： G06Q20/02 , G06Q20/36 , G06Q20/38
摘要： A method for validating a transaction transmitted on a distributed ledger system network includes receiving, by a first node of the distributed ledger system network, verification data associated with the transaction from a second node of the distributed ledger system network.The verification data includes a digital signature generated in a secure enclave of the second node. The first node integrates the verification data into a distributed ledger of the distributed ledger system network.

6. 发明申请

WO2023083525A1 FAST BLOCKCHAIN PAYMENT METHOD AND SYSTEM 审中-公开
公开(公告)号：WO2023083525A1
公开(公告)日：2023-05-19
申请号：PCT/EP2022/076860
申请日：2022-09-27
申请人： NEC LABORATORIES EUROPE GMBH
发明人： GNAP, Sven , KOSTIAINEN, Kari , KARAME, Ghassan , CAPKUN, Srdjan
IPC分类号： H04L9/00
摘要： Disclosed is a method for fast blockchain payment, the payment involving a transfer of funds from an account of a user (110) to a private collateral account of a service provider (120). According to embodiments, the method comprises receiving, by the service provider (120), a private payment intent from the user (110), the private payment intent including a payment index, a random payment ID and an address of the service provider's (120) private collateral account; modifying, by the service provider (120), the payment intent by replacing the address of the service provider's (120) collateral account by a commitment and providing the modified payment intent to a majority of a blockchain's (140) statekeepers (130); receiving, by the service provider (120), payment approvals from blockchain's (140) statekeepers (130), each payment approval including the modified payment intent signed with a private key of the respective statekeeper (130); evaluating, by the service provider (120), the received payment approvals, aggregating the successfully evaluated payment approvals, and transmitting the aggregation result to the user (110); and receiving, by the service provider (120), a final transaction created by the user (110) after having verified the aggregation result, verifying that the user (110) correctly constructed the final transaction according to a given protocol, and accepting the payment in case of successful verification of the final transaction.

7. 发明申请

WO2023072390A1 METHOD AND HOST SYSTEM FOR SECURE ENCLAVE MIGRATION 审中-公开
公开(公告)号：WO2023072390A1
公开(公告)日：2023-05-04
申请号：PCT/EP2021/079884
申请日：2021-10-27
申请人： NEC LABORATORIES EUROPE GMBH
发明人： BRIONGOS, Samira , SORIENTE, Claudio , KARAME, Ghassan
IPC分类号： G06F21/53 , G06F9/455
摘要： The present invention provides a method for enabling enclave migration, wherein the contents of the enclave and its sealed data are transferred from a first machine – sending host (200S) – to a second machine – receiving host (200R). The method comprises performing attestation between a security monitor (130S) of the sending host (200S) and a security monitor (130R) of the receiving host (200R) including an exchange of a shared cryptographic key K between the two security monitors (130S, 130R); using the shared cryptographic key K to implement a secure communication channel between the two security monitors (130S, 130R); executing, by the two security monitors (130S, 130R) via the secure communication channel, a predetermined transfer protocol, the transfer protocol including an initial exchange of verification messages between the security monitors (130S, 130R) to verify that both security monitors (130S, 130R) are ready and can execute the transfer, and a subsequent transfer of the enclave data between the security monitors (130S, 130R). Timeouts defining a maximum admissible time duration for particular steps of the transfer protocol may be implemented both for the initial exchange of the verification messages and for the subsequent transfer of the enclave data.

8. 发明申请

WO2021175410A1 METHOD FOR SUPPORTING SHARING OF TRAVEL HISTORY OF TRAVELERS IN AIRPORTS 审中-公开
公开(公告)号：WO2021175410A1
公开(公告)日：2021-09-10
申请号：PCT/EP2020/055479
申请日：2020-03-02
申请人： NEC LABORATORIES EUROPE GMBH
发明人： ANDREINA, Sébastien , KARAME, Ghassan
IPC分类号： H04L9/32 , G06F21/64 , H04L29/06
摘要： A method for supporting sharing of travel history of travelers in airports, wherein the travelers' identity is managed using a distributed ledger system, wherein the distributed ledger system includes a global identity blockchain and several per segment security blockchains, wherein the global identity blockchain is accessible by entities of the distributed ledger system, and wherein a per segment security blockchain is employed for a predetermined flight segment, such that the per segment security blockchain is accessible only by entities of the distributed ledger system that are involved in the predetermined flight segment, the method comprising the steps of: a) generating a history secret of a traveler according to a resistance mechanism for resisting a creation of multiple identities, in particular a Sybil-resistance mechanism; b) receiving, by the global identity blockchain, a registration request of the traveler, wherein the registration request comprises a commitment of the traveler's history secret, and wherein the global identity blockchain verifies the validity of the commitment; c) receiving, by the per segment security blockchain, aticket transaction that is issued by an airline entity, wherein theticket transaction comprise information on the identity of the traveler and information on the time of journey; d) recording, by the per segment security blockchain, a share travel history request from the traveler, wherein the share travel history request comprises a partial history secret, and wherein the per segment security blockchain verifies the validity of the partial history secret.

9. 发明申请

WO2020182430A1 METHODS OF ELECTING LEADER NODES IN A BLOCKCHAIN NETWORK USING A ROLE-BASED CONSENSUS PROTOCOL 审中-公开
公开(公告)号：WO2020182430A1
公开(公告)日：2020-09-17
申请号：PCT/EP2020/054259
申请日：2020-02-18
申请人： NEC LABORATORIES EUROPE GMBH
发明人： KARAME, Ghassan , LI, Wenting
IPC分类号： H04L9/32
摘要： A method for electing a leader in a blockchain network using a role-based consensus protocol includes generating a new block by a node in the blockchain network and computing an effective resources metric for the node based on a role of the node, resources of the node and a role-based weight profile for the resources of the node. Eligibility proof of the node is generated based on eligibility information that includes a blockheader of the new block, an identity of the node, a difficulty target, T, of the blockchain network, and the effective resources metric. The new block and the eligibility proof is broadcast to the blockchain network, to enable one or more other nodes in the blockchain network to verify eligibility of the node as a leader.

10. 发明申请

WO2020064962A1 METHOD AND SYSTEM FOR A TRUSTED EXECUTION ENVIRONMENT-BASED PROOF OF STAKE PROTOCOL 审中-公开
公开(公告)号：WO2020064962A1
公开(公告)日：2020-04-02
申请号：PCT/EP2019/076105
申请日：2019-09-26
申请人： NEC LABORATORIES EUROPE GMBH
发明人： ANDREINA, Sébastien , KARAME, Ghassan , LI, Wenting , MARSON, Giorgia Azzurra
IPC分类号： H04L9/08
摘要： A method prevents posterior-corruption long-range attacks in a proof of stake blockchain protocol on a blockchain network. The method includes: generating, by a blockchain node, a fresh key pair, having a fresh public key to be included into a transaction and a fresh private key to be used for signing a next transaction; generating, by the blockchain node, the transaction having as an input an overall stake associated to an account of the blockchain node, and as an output a transfer stake to be transferred to a second node's public key, and a remaining account stake to be transferred to the fresh public key; signing, by the blockchain node, the transaction with a previous private key; and broadcasting, by the blockchain node, the generated transaction to the blockchain network.

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