1. Full name of electronic cash: electronic cash. Also known as electronic money or digital currency, it is a very important electronic payment system, which can be regarded as the electronic or digital simulation of real money. Electronic cash exists in the form of digital information and circulates through the Internet. But it is more convenient and economical than real money. Its simplest form includes three subjects: merchants, users and banks; And four security protocol processes: initialization protocol, withdrawal protocol, payment protocol and deposit protocol. Chaum [2] put forward the first electronic cash scheme in 1982. It is implemented by blind signature technology, which can completely protect the privacy of users. However, this completely anonymous electronic cash has also provided convenience for many criminals, who use its completely anonymity to carry out some illegal and criminal activities, such as corruption and illegal purchases (such as buying drugs and arms). ), extortion and so on. Even if the police get the stolen money, they can't catch the criminal. Therefore, a reasonable electronic cash system should be incomplete or conditionally anonymous. In 1995, Stadhle et al [3] put forward the concept of fair blind signature, which can be used in conditional anonymous payment system. In 1996, Camenisch et al. [4] and Frankel et al. [5] independently put forward the concept of fair off-line electronic cash for the first time, and gave two schemes at the same time. The anonymity of users in fair electronic cash is incomplete, and it can be revoked by a trusted third party (TTP), thus using the complete anonymity of electronic cash to prevent criminal activities.
2. Open the online banking of Bank of Communications, and visit the website of Bank of Communications for inquiry. First enter the Bank of Communications in official website. The second is SMS password user login, certificate user login and ordinary user login. These three login methods correspond to users who have opened online banking, users who have purchased U shield protection, and ordinary users who have not opened e-banking business with bank cards. Click to enter according to your user attributes. Third, select balance query in your personal user interface. In this module, we provide you with many functions such as general account inquiry, single account inquiry, transaction details inquiry, online payment inquiry, passbook account inquiry, general account setting, account deletion, inquiry password modification, transaction password modification, account loss reporting, wealth management sub-account management, wealth management customer assets and liabilities inquiry, monthly statement inquiry, contract information inquiry and so on. Common account query can query common accounts set in Common Account Settings, up to five accounts, including online banking signing cards. For debit card accounts, information such as account number, account type and balance can be displayed in linkage, and transaction details can be queried. For credit card accounts, available amount, available cash amount that can be borrowed, etc. Be displayed. You can use a single account to query the petty cash, card deposit account (including foreign exchange treasure account), fund account and other information in a single account, and you can query the transaction details of petty cash account in linkage.