This paper proposes a(t,n)-threshold verifiable secret sharing scheme with changeable parameters based on a trapdoor one-way function.This scheme consists of a generation phase,a distribution phase,an encoding phase a...This paper proposes a(t,n)-threshold verifiable secret sharing scheme with changeable parameters based on a trapdoor one-way function.This scheme consists of a generation phase,a distribution phase,an encoding phase and a reconstruction phase.The generation and distribution phases are,respectively,based on Shamir’s and Feldman’s approaches,while the encoding phase is based on a novel trapdoor one-way function.In the reconstruction phase,the shares and reconstructed secret are validated using a cryptographic hash function.In comparison with existing schemes,the proposed scheme leaks no direct information about the secret from public information.Furthermore,unlike some existing schemes,the generation and distribution phases of the proposed scheme are both independent of the secret.This feature leads to a number of advantages over existing approaches such as the dealer’s ability to perform the following modifications without updating the shares(i)modify the secret and(ii)adjust the threshold parameters of the scheme.Furthermore,each participant receives a single share,and designated participants can be given the privilege of choosing their own shares for reconstructing a secret S.Moreover,the proposed scheme possesses a high level of security which is inherited from the schemes of Shamir and Feldman,in addition to the trapdoor one-way function and the employed cryptographic hash function.展开更多
随着区块链的迅速发展,上链数据不仅包括金融交易数据,还包括科技、文化、政治等多类数据.而在现有的区块链系统中,数据一旦上链便无法更改,可能会面临失效数据无法删除、错误数据无法修改等问题.因此,特定条件下可修改的区块链方案具...随着区块链的迅速发展,上链数据不仅包括金融交易数据,还包括科技、文化、政治等多类数据.而在现有的区块链系统中,数据一旦上链便无法更改,可能会面临失效数据无法删除、错误数据无法修改等问题.因此,特定条件下可修改的区块链方案具有广阔的应用前景.在POSpace(proof of space)共识机制下,基于陷门单向函数和新型区块链结构,提出了可修改的区块链方案.只要超过阈值数的节点同意,便可实现区块数据的合法修改,否则不能进行修改.除修改数据外,其余区块数据保持不变,全网节点仍可按原始验证方式对数据合法性进行验证.仿真实验表明:只要选定合适的阈值,所提方案中,区块生成与数据修改的效率均很高,数据的修改并不改变区块之间的链接关系,具有现实可操作性.展开更多
文摘This paper proposes a(t,n)-threshold verifiable secret sharing scheme with changeable parameters based on a trapdoor one-way function.This scheme consists of a generation phase,a distribution phase,an encoding phase and a reconstruction phase.The generation and distribution phases are,respectively,based on Shamir’s and Feldman’s approaches,while the encoding phase is based on a novel trapdoor one-way function.In the reconstruction phase,the shares and reconstructed secret are validated using a cryptographic hash function.In comparison with existing schemes,the proposed scheme leaks no direct information about the secret from public information.Furthermore,unlike some existing schemes,the generation and distribution phases of the proposed scheme are both independent of the secret.This feature leads to a number of advantages over existing approaches such as the dealer’s ability to perform the following modifications without updating the shares(i)modify the secret and(ii)adjust the threshold parameters of the scheme.Furthermore,each participant receives a single share,and designated participants can be given the privilege of choosing their own shares for reconstructing a secret S.Moreover,the proposed scheme possesses a high level of security which is inherited from the schemes of Shamir and Feldman,in addition to the trapdoor one-way function and the employed cryptographic hash function.
文摘随着区块链的迅速发展,上链数据不仅包括金融交易数据,还包括科技、文化、政治等多类数据.而在现有的区块链系统中,数据一旦上链便无法更改,可能会面临失效数据无法删除、错误数据无法修改等问题.因此,特定条件下可修改的区块链方案具有广阔的应用前景.在POSpace(proof of space)共识机制下,基于陷门单向函数和新型区块链结构,提出了可修改的区块链方案.只要超过阈值数的节点同意,便可实现区块数据的合法修改,否则不能进行修改.除修改数据外,其余区块数据保持不变,全网节点仍可按原始验证方式对数据合法性进行验证.仿真实验表明:只要选定合适的阈值,所提方案中,区块生成与数据修改的效率均很高,数据的修改并不改变区块之间的链接关系,具有现实可操作性.
