(Since it's paid, it's free as long as a 30-day trial. 1Password is a password protection software produced by AgileWebSolutions. iPassword can help you create very secure and unique passwords directly in your browser, and then help you remember them. GoFill: With just one click, 1Password can help you open and log in to websites. This greatly saves your time online while enhancing the security of your account. Now, 1Password is available for iPad, iPhone, iPod Touch and Mac as well as Windows Beta. With so many versions, you may find it very inconvenient. If you switch machines frequently, you will not only need to install 1Password on all machines, but also keep your passwords on all machines. The original is for convenience, but it brings so much "inconvenience". Haha, don't worry about this. To synchronize, don't we already have Dropbox (@XDash: There are also a number of domestic cloud storage synchronization tools)? 1Password will generate a configuration folder on your system, you just need to drag this folder to Dropbox, it will be able to help you sync passwords on all computers. There are two versions of the system downloaded here: Windows and Mac. Other tablet and mobile phone systems are available in those stores. Tutorial: netsecurity.51cto/art/201103/251695.htm More security tools: netsecurity.51cto/art/201011/235748.htm More network management tools: network.51cto/art/201101/242851.htm)