The Experts below are selected from a list of 324 Experts worldwide ranked by ideXlab platform

Jun Shao - One of the best experts on this subject based on the ideXlab platform.

  • Secure threshold multi Authority attribute based encryption without a Central Authority
    Information Sciences, 2010
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme which requires a fully trusted Central Authority who has the ability to decrypt each ciphertext in the system. This Central Authority would endanger the whole system if it is corrupted. This paper provides a threshold multi Authority fuzzy identity based encryption (MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d"k of the given attributes about the message for at least t+1,t=

  • secure threshold multi Authority attribute based encryption without a Central Authority
    International Conference on Cryptology in India, 2008
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme in TCC 2007 as an answer to an open problem presented by Sahai and Waters in EUROCRYPT 2005. However, her scheme needs a fully trusted Central Authority which can decrypt every ciphertext in the system. This Central Authority would endanger the whole system if it's corrupted. This paper presents a threshold multi Authority fuzzy identity based encryption(MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d k of the given attributes about the message for at least t + 1, t ≤ n /2 honest authorities of all the n attribute authorities in the proposed scheme. The security proof is based on the secrecy of the underlying joint random secret sharing protocol and joint zero secret sharing protocol and the standard decisional bilinear Diffie-Hellman assumption. The proposed MA-FIBE could be extended to the threshold multi Authority attribute based encryption (MA-ABE) scheme and be further extended to a proactive MA-ABE scheme.

  • INDOCRYPT - Secure Threshold Multi Authority Attribute Based Encryption without a Central Authority
    Progress in Cryptology - INDOCRYPT 2008, 2008
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme in TCC 2007 as an answer to an open problem presented by Sahai and Waters in EUROCRYPT 2005. However, her scheme needs a fully trusted Central Authority which can decrypt every ciphertext in the system. This Central Authority would endanger the whole system if it's corrupted. This paper presents a threshold multi Authority fuzzy identity based encryption(MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d k of the given attributes about the message for at least t + 1, t ≤ n /2 honest authorities of all the n attribute authorities in the proposed scheme. The security proof is based on the secrecy of the underlying joint random secret sharing protocol and joint zero secret sharing protocol and the standard decisional bilinear Diffie-Hellman assumption. The proposed MA-FIBE could be extended to the threshold multi Authority attribute based encryption (MA-ABE) scheme and be further extended to a proactive MA-ABE scheme.

Huang Lin - One of the best experts on this subject based on the ideXlab platform.

  • Secure threshold multi Authority attribute based encryption without a Central Authority
    Information Sciences, 2010
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme which requires a fully trusted Central Authority who has the ability to decrypt each ciphertext in the system. This Central Authority would endanger the whole system if it is corrupted. This paper provides a threshold multi Authority fuzzy identity based encryption (MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d"k of the given attributes about the message for at least t+1,t=

  • secure threshold multi Authority attribute based encryption without a Central Authority
    International Conference on Cryptology in India, 2008
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme in TCC 2007 as an answer to an open problem presented by Sahai and Waters in EUROCRYPT 2005. However, her scheme needs a fully trusted Central Authority which can decrypt every ciphertext in the system. This Central Authority would endanger the whole system if it's corrupted. This paper presents a threshold multi Authority fuzzy identity based encryption(MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d k of the given attributes about the message for at least t + 1, t ≤ n /2 honest authorities of all the n attribute authorities in the proposed scheme. The security proof is based on the secrecy of the underlying joint random secret sharing protocol and joint zero secret sharing protocol and the standard decisional bilinear Diffie-Hellman assumption. The proposed MA-FIBE could be extended to the threshold multi Authority attribute based encryption (MA-ABE) scheme and be further extended to a proactive MA-ABE scheme.

  • INDOCRYPT - Secure Threshold Multi Authority Attribute Based Encryption without a Central Authority
    Progress in Cryptology - INDOCRYPT 2008, 2008
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme in TCC 2007 as an answer to an open problem presented by Sahai and Waters in EUROCRYPT 2005. However, her scheme needs a fully trusted Central Authority which can decrypt every ciphertext in the system. This Central Authority would endanger the whole system if it's corrupted. This paper presents a threshold multi Authority fuzzy identity based encryption(MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d k of the given attributes about the message for at least t + 1, t ≤ n /2 honest authorities of all the n attribute authorities in the proposed scheme. The security proof is based on the secrecy of the underlying joint random secret sharing protocol and joint zero secret sharing protocol and the standard decisional bilinear Diffie-Hellman assumption. The proposed MA-FIBE could be extended to the threshold multi Authority attribute based encryption (MA-ABE) scheme and be further extended to a proactive MA-ABE scheme.

Ingo Weber - One of the best experts on this subject based on the ideXlab platform.

  • BPM - Untrusted Business Process Monitoring and Execution Using Blockchain
    Lecture Notes in Computer Science, 2016
    Co-Authors: Ingo Weber, Régis Riveret, Alexander Ponomarev, Guido Governatori, X. Xu, Jan Mendling
    Abstract:

    The integration of business processes across organizations is typically beneficial for all involved parties. However, the lack of trust is often a roadblock. Blockchain is an emerging technology for deCentralized and transactional data sharing across a network of untrusted participants. It can be used to find agreement about the shared state of collaborating parties without trusting a Central Authority or any particular participant. Some blockchain networks also provide a computational infrastructure to run autonomous programs called smart contracts. In this paper, we address the fundamental problem of trust in collaborative process execution using blockchain. We develop a technique to integrate blockchain into the choreography of processes in such a way that no Central Authority is needed, but trust maintained. Our solution comprises the combination of an intricate set of components, which allow monitoring or coordination of business processes. We implemented our solution and demonstrate its feasibility by applying it to three use case processes. Our evaluation includes the creation of more than 500 smart contracts and the execution over 8,000 blockchain transactions.

  • untrusted business process monitoring and execution using blockchain
    Business Process Management, 2016
    Co-Authors: Régis Riveret, Alexander Ponomarev, Guido Governatori, Ingo Weber, Jan Mendling
    Abstract:

    The integration of business processes across organizations is typically beneficial for all involved parties. However, the lack of trust is often a roadblock. Blockchain is an emerging technology for deCentralized and transactional data sharing across a network of untrusted participants. It can be used to find agreement about the shared state of collaborating parties without trusting a Central Authority or any particular participant. Some blockchain networks also provide a computational infrastructure to run autonomous programs called smart contracts. In this paper, we address the fundamental problem of trust in collaborative process execution using blockchain. We develop a technique to integrate blockchain into the choreography of processes in such a way that no Central Authority is needed, but trust maintained. Our solution comprises the combination of an intricate set of components, which allow monitoring or coordination of business processes. We implemented our solution and demonstrate its feasibility by applying it to three use case processes. Our evaluation includes the creation of more than 500 smart contracts and the execution over 8,000 blockchain transactions.

Jan Mendling - One of the best experts on this subject based on the ideXlab platform.

  • BPM - Untrusted Business Process Monitoring and Execution Using Blockchain
    Lecture Notes in Computer Science, 2016
    Co-Authors: Ingo Weber, Régis Riveret, Alexander Ponomarev, Guido Governatori, X. Xu, Jan Mendling
    Abstract:

    The integration of business processes across organizations is typically beneficial for all involved parties. However, the lack of trust is often a roadblock. Blockchain is an emerging technology for deCentralized and transactional data sharing across a network of untrusted participants. It can be used to find agreement about the shared state of collaborating parties without trusting a Central Authority or any particular participant. Some blockchain networks also provide a computational infrastructure to run autonomous programs called smart contracts. In this paper, we address the fundamental problem of trust in collaborative process execution using blockchain. We develop a technique to integrate blockchain into the choreography of processes in such a way that no Central Authority is needed, but trust maintained. Our solution comprises the combination of an intricate set of components, which allow monitoring or coordination of business processes. We implemented our solution and demonstrate its feasibility by applying it to three use case processes. Our evaluation includes the creation of more than 500 smart contracts and the execution over 8,000 blockchain transactions.

  • untrusted business process monitoring and execution using blockchain
    Business Process Management, 2016
    Co-Authors: Régis Riveret, Alexander Ponomarev, Guido Governatori, Ingo Weber, Jan Mendling
    Abstract:

    The integration of business processes across organizations is typically beneficial for all involved parties. However, the lack of trust is often a roadblock. Blockchain is an emerging technology for deCentralized and transactional data sharing across a network of untrusted participants. It can be used to find agreement about the shared state of collaborating parties without trusting a Central Authority or any particular participant. Some blockchain networks also provide a computational infrastructure to run autonomous programs called smart contracts. In this paper, we address the fundamental problem of trust in collaborative process execution using blockchain. We develop a technique to integrate blockchain into the choreography of processes in such a way that no Central Authority is needed, but trust maintained. Our solution comprises the combination of an intricate set of components, which allow monitoring or coordination of business processes. We implemented our solution and demonstrate its feasibility by applying it to three use case processes. Our evaluation includes the creation of more than 500 smart contracts and the execution over 8,000 blockchain transactions.

Xiaohui Liang - One of the best experts on this subject based on the ideXlab platform.

  • Secure threshold multi Authority attribute based encryption without a Central Authority
    Information Sciences, 2010
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme which requires a fully trusted Central Authority who has the ability to decrypt each ciphertext in the system. This Central Authority would endanger the whole system if it is corrupted. This paper provides a threshold multi Authority fuzzy identity based encryption (MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d"k of the given attributes about the message for at least t+1,t=

  • secure threshold multi Authority attribute based encryption without a Central Authority
    International Conference on Cryptology in India, 2008
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme in TCC 2007 as an answer to an open problem presented by Sahai and Waters in EUROCRYPT 2005. However, her scheme needs a fully trusted Central Authority which can decrypt every ciphertext in the system. This Central Authority would endanger the whole system if it's corrupted. This paper presents a threshold multi Authority fuzzy identity based encryption(MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d k of the given attributes about the message for at least t + 1, t ≤ n /2 honest authorities of all the n attribute authorities in the proposed scheme. The security proof is based on the secrecy of the underlying joint random secret sharing protocol and joint zero secret sharing protocol and the standard decisional bilinear Diffie-Hellman assumption. The proposed MA-FIBE could be extended to the threshold multi Authority attribute based encryption (MA-ABE) scheme and be further extended to a proactive MA-ABE scheme.

  • INDOCRYPT - Secure Threshold Multi Authority Attribute Based Encryption without a Central Authority
    Progress in Cryptology - INDOCRYPT 2008, 2008
    Co-Authors: Huang Lin, Zhenfu Cao, Xiaohui Liang, Jun Shao
    Abstract:

    An attribute based encryption scheme (ABE) is a cryptographic primitive in which every user is identified by a set of attributes, and some function of these attributes is used to determine the ability to decrypt each ciphertext. Chase proposed the first multi Authority ABE scheme in TCC 2007 as an answer to an open problem presented by Sahai and Waters in EUROCRYPT 2005. However, her scheme needs a fully trusted Central Authority which can decrypt every ciphertext in the system. This Central Authority would endanger the whole system if it's corrupted. This paper presents a threshold multi Authority fuzzy identity based encryption(MA-FIBE) scheme without a Central Authority for the first time. An encrypter can encrypt a message such that a user could only decrypt if he has at least d k of the given attributes about the message for at least t + 1, t ≤ n /2 honest authorities of all the n attribute authorities in the proposed scheme. The security proof is based on the secrecy of the underlying joint random secret sharing protocol and joint zero secret sharing protocol and the standard decisional bilinear Diffie-Hellman assumption. The proposed MA-FIBE could be extended to the threshold multi Authority attribute based encryption (MA-ABE) scheme and be further extended to a proactive MA-ABE scheme.