(Image credit: Boris Zhitkov / Getty Images) An analysis of VPN accounts has revealed a number of VPNs allow you to sign up using insecure and easy-to-hack passwords. At least seven VPNs we tested accept "password" and "12345678," but others have far stronger requirements. Having a minimum character limit, and using a mixture of letters, numbers, and symbols, are some of the rules users have to abide by. When signing up for an account with one of the best VPNs – and any account for that matter – we recommend using complex, secure passwords. VPNs are champions of digital privacy and online safety, so we'd expect them to follow strict rules when it comes to password creation. Some do, but others don't – and some big names failed our tests. What did we test? Apart from some notable exceptions, most VPNs require you to create an account to sign up for a subscription. This usually requires a username and password.…