A report released by the online security firm SplashData yesterday found that the most commonly used passwords by global Internet users were '123456' and 'password' in 2015 – unchanged since 2011.

The fifth annual report by SplashData was compiled from more than two million leaked passwords during the year, and showed little change. Despite the introduction of some new and longer passwords required by some websites, "the longer passwords are so simple as to make their extra length virtually worthless as a security measure," the company said in a blog post.

Among other top passwords were '12345678', 'qwerty', '12345' and '123456789', according to the report.

Other popular password are based on standard keyboard patterns like '1qaz2wsx' (first two columns of main keys) or 'qwertyuiop' (top row of keys) but are "based on simple patterns that would be easily guessable by hackers," SplashData said.

"We have seen an effort by many people to be more secure by adding characters to passwords, but if these longer passwords are based on simple patterns they will put you in just as much risk of having your identity stolen by hackers," said SplashData chief executive Morgan Slain.