What is a simple way to lock the content of a webpage?

For example, just requiring a user name foo and password bar, or user name foo, a开发者_高级运维nd the password is today's date, take day of month (such as the 16 in Oct 16), multiply by 2 and repeat twice, which is 3232?

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Pick a hard-to-guess password and just use that. Your web server probably has a method for providing password-protected access and it will almost certainly support as many users as you like.

Remember to think of passwords as simply a shared secret. Your complicated date arithmetic is also a shared secret, but it is fundamentally no more or less secure than a password. If you choose sensible passwords (i.e. not guessable, ideally random) then you don't need to muck around with convoluted schemes.