A few odds and ends done in javascript

There are 3 different encryption systems here:

• The first is a substitution cypher, each letter is replaced with a different letter. This form of encryption is very easy to crack on any message of a reasonable length.
• The second is in some wasy simpler and in other ways more complex. It is based on a shift cypher, the alphabet is simply shifted a fixed number of characters. Further complexity is added by using several different shifts, how many and how much each one is shifted is determined by a keyword. With a long keyword and a short message this results in a simple but relativly secure code.
• The final code is a very different creature. Rather than simply manipulating the letters in the message this cypher treats the message as a sequence of numbers and performs a seemingly random but repeatable sequence of changes to those numbers. A key number is used to generate the starting point for these calculations. Unlike the previous two systems decryption under this system is achieved by simply encoding the message a second time using the same key. There is also an explanation of why this encryption system works.

Here is a blackjack game. The basics of the game are there but not all possible options are allowed. Currently all the cards show up as being in the same suit and splitting is not implimented. The game is currently set to play with two packs of cards and impliments a semi-realistic system for cutting and shuffling the deck. In otherwords unlike some other blackjack implimentations out there it is possible to card count this game.

And at the risk of being helpful there is also a page that will calculate the subnet for given IP addresses and subnet masks