Mike and Jennifer,
Previous chain getting too long (bounce long!), and none of us truncated -
sorry!
Re Quiz Answers, Shhhh, tell no one...
This is a classic encryption technique that’s weak and easy for cryptographers
to break. Your students will never figure it out! It makes use of the obscure
(and obtuse) XOR logic operator (^). Basically, it diddles ascii character
binary bits in such a way that the encryption and decryption functions are one
and the same. The encrypted data (see code below) is stored in
globalAnswerHolder. While this is a string, don’t try to view it. It can
contain many non-printable characters. The intKey argument is simply an integer
encryption key - e.g. 100. Actually, it’s the integer’s binary equivalent that
is the key.
var globalAnswerHolder;
function encryptAndDecrypt(strDataToProcess, intKey) {
var strBuilder = "";
for(i=0;i < strDataToProcess.length;i++) {
strBuilder += String.fromCharCode(intKey ^
strDataToProcess.charCodeAt(i));
}
globalAnswerHolder = strBuilder;
}
Just pass globalAnswerHolder through the function again to decrypt.
Of course your students could do this also, so obscure the function:
var theBoyCouldPlay;
function Ish(Mark, Knopfler) {
var Kabbible = "";
for(i=0;i < Mark.length;i++) {
Kabbible += String.fromCharCode(Knopfler ^ Mark.charCodeAt(i));
}
theBoyCouldPlay = Kabbible;
}
Your students will be in Comedic Dire Straits (ouch)!
Otis
--
Otis Rothenberger
o...@chemagic.org
http://chemagic.org
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