Used to protect the security of Alipay account. Security control is essentially a small program. Written by each website according to needs, when the registered members of the website log in to the website, the security control plays a role, and then through SSL encryption of key data, prevent the account password from being stolen by the Trojan horse program or virus, can effectively prevent the Trojan to intercept the keyboard record. When the security control works, it can monitor the data flow of the website and the client terminal in real time from the customer's login to the logout. Due to the protection of security controls, the customer's account and password are still relatively safe websites, most of them will use security controls to protect the customer's account password and other information. Security controls are many small programs that must be installed before using online banking.