Advanced Password Checker

This script uses an array to store the usernames and passwords. It also uses a prompt box for username and password info and uses the indexOf property to search the array for a username and password match in a for.. loop.

ASCII Encryption

(Internet Explorer Only) A very simple encryption method that uses random values for each character. Interestingly, you can encrypt the same string as many times as you want and the result will always be different. Best used with short strings.

Character Encoder

Encrypts a string by converting each character to it's ASCII key code. Supports two-way encryption - from a string to the numeric code, or from the numeric code back to the string. You can, for example, send the encrypted code to a friend and have them decode it with this script.

Cookie

You can use a basic cookie script to keep visitors (that don't have the cookie on their system) from viewing certain parts of your site (kind of.... There are always ways around it). The cookie is placed when the password provided is correct. Then, when they are forwarded to the password protected page, the cookie allows them to stay. Those without the cookie are sent back.

Gatekeeper

Here is the best password protection script I have come across. It is also definitely the most user friendly. Try it out! (Note: The password is the filename without the .html ending.)

Login Coder

This is undoubtedly the best password protection JavaScript you'll ever find. Besides supporting multiple users, multiple passwords, and even multiple destination pages (after they successfully login), this script is presented in a very easy-to-use interface.

Multiple Users

Rather not have one password for access the Members-Only section of your site? Well, along comes this little JavaScript gem. You can set up a separate username and password for as many members as you want, and even give each a different page to go to after logging in!

Multiple Users Prompt

This JavaScript is just like the previous Multiple Users one, but doesn't use a table interface to login. Instead, after clicking the Login! button, the script will ask them for their username and password, and then perform the password-protection.

Password Generator

Generate a random password with the ability to include special characters and password restrictions.

Password Pro

This script uses a different approach to Password Protection. It still uses the password as the actual page, but it uses an encryption method that encrypts and checks the password. So if you fail to enter it correct after 3 times you go to a specific page (specified by the webmaster) and you don't get the annoying 404 page not found message as in other scripts.

Password Prompt

If a visitor wants to go a password protected page, they must first enter the correct password on the page with this script (this page) This script will just take you to [password you enter].html This is a very good script if JavaScript is enabled and as long as you have an index.html file in your directory. As an added bonus, it's only 8 lines! Unlike the others, the password is the protected filename without the .html ending.

Password Protect

Use this script to protect online files. Users cannot cancel out of it. It can also be used with your browser's home page to control Internet access on your own computer.

Random Password Generator

This script can be used to generate random passwords for improved password strength.

Slide Encryption Program

This is another basic encryption/decryption program. The difference is this script can shift characters based on user input and you can use more than one key making your security even more difficult to break.

Text Encryption

This JavaScript library provides encryption using simple, text-oriented method called column transposition. The idea is to write the plain text in block on the row-first bases. The text is then read column-first. The trick is in that the columns are not read from left to right, but in the order specified by the encryption key. Transliteration is also used.

Three Tries

If you want to 'protect' a site and don't have CGI access, you can try this JavaScript. Visitors get three tries to enter the correct password then they are refused entry.

UNIX crypt(3) encryption

.htpasswd files use crypt(3) to generate encryptions, and this script will do it for you without UNIX or an online script! Provided in .js format for your convenience.

Virgenere Encryption

A fine example of the classic virgenere script and is nearly impossible to decode, even when using frequency analysis. This script is also entertaining since you can actually see the encryption taking place.

XOR Encryption4

This encryption method performs a bitwise XOR on each character of the data you wish to encrypt with a series of mathematically generated keys. This key is generated using a pseudo-random number generator using a hash of the password as the seed. The security of the encrypted data is dependent on the length and randomness of the key. Don't make this script the only form of security on your site as XOR encryption has its weaknesses.