本发明公开了一种基于双随机相位图像编码系统的密码学破解方法和装置，其中，上述密码学破解方法运用混合自适应迭代相位恢复算法，在已知输入面频率域强度的情况下，通过相位恢复算法就能够恢复输入面的振幅(即明文)及相位(即空间域密钥)，随后还可计算出频率域密钥。破解过程中除了待解密图像的密文，无需任何其它先验信息，有效了降低了破解实施难度。

本发明主要属于信息技术领域，具体涉及一种基于动态规则的密码学属性基访问控制方法与系统。在所述系统中受保护的客体以加密形式存储，只有满足属性基访问控制中访问策略要求的访问才能获得授权而解密客体，能够保证在不安全环境下的数据能够按照安全策略被授权访问，同时也支持策略可扩展与属性的动态获取。本发明所述基于动态规则的密码属性基访问控制方法与系统已经脱离传统的加密系统框架，是一种全新的支持密码学判定的属性基访问控制模型、方法和系统，可实现更加安全、多样、动态、灵活的访问授权，适用于大规模组织或信息系统，可以应用到诸如云计算、网格计算、分布式计算等环境。

一种集合成员关系判定的密码学构造方法及系统，能够对集合成员关系进行密码学表示，所述方法包括：将集合U中的每个元素e _i转化为密码学空间内的随机点v _i；获取给定集合S={ e ₁',…, e _m'}⊆U，确定集合S中的每个元素e _i'对应的随机点v _i'，并根据所述随机点v _i'构造函数f _S(x)；引入一个随机秘密γ，根据所述函数f _S(x)确定f _S(γ)，并根据所述随机秘密γ确定公开参数mpk；以所述公开参数mpk作为输入对f _S(γ)进行处理生成所述集合S的密码学表示。所述密码学表示可实现集合成员关系判定：根据集合S的极点聚合函数输出的聚合值R _S构造对R _S的承诺；对于元素e _i，当e _i∈S时，根据集合S_＝S\{e _i}的零点聚合函数输出的聚合值R _{S_}验证所述承诺。可用于构造满足集合成员关系的广播加密、基于属性加密、谓词加密等群组密码系统。

The present invention relation to a digital transaction apparatus including a Data Assistance Device (DAD) including, a user interface that is operable to at least select data, and a DAD transceiver, a Digital Transaction Card (DTC), including a Digital Transaction Processing Unit (DTPU), and a DTC transceiver, wherein the DAD and DTC are operable to transfer data from the DAD to the DTC and when subsequently using the DTC to effect a digital transaction, the DTC operates in accordance with the data selected and transferred from the DAD to the DTC, and wherein the DTC is further operable to send at least one DTC link code to the DAD, and the DAD is operable to send the at least one DAD link code to the DTC by respective transceivers, the DTC being further operable to verify a received at least one DAD link code, and the DAD being further operable to verify a received at least one DTC link code, whereby a link is formed between the DAD and the DTC subsequent to a selected threshold of verification by the DTC and/or the DAD

A blockchain protocol for creating a public record of transactions to ensure only valid tokens can be used as transaction inputs, and used only one time. Transactions are assembled into a blockchain and digitally signed by a set of witnesses that verify the signature; a new key pair is generated to sign the next block in the chain, and the key used to sign the indelible block is erased to keep the historical record secure.