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Mega Tokyo AGI Archive / Re:Contest Results
« on: August 27, 2004, 09:26:10 PM »
playing through them now. chad's game reminds me of sprockets
-nick
-nick
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Mega Tokyo AGI Archive / Re:Is AGIDEV down?
« on: June 30, 2004, 02:45:31 AM »
My uni's had this major network restructure and my webhost changed its IP as a result. I just have to do some magic jiggerpokery and get it working again 
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:Poll: Where are you from?
« on: April 18, 2004, 01:04:49 AM »
I'm in Tasmania. Tassie Devils and pigmies y'know?
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:matches in enclosure
« on: February 18, 2004, 06:48:12 PM »AND I HAD ENOUGH OF YOUR SUBTLE HINTS I WANT BIG SPOILERS!!!
You're quite welcome.
- Nick
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Mega Tokyo AGI Archive / Re:matches in enclosure
« on: February 17, 2004, 06:40:44 PM »
well there wouldn't be many rooms to search. look carefully.
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:matches in enclosure
« on: February 17, 2004, 10:02:23 AM »
Listen carefully to what Lisa says the chef is doing before the end.
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:matches in enclosure
« on: February 16, 2004, 03:56:54 PM »
read any good poems lately?
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:matches in enclosure
« on: February 15, 2004, 03:55:08 PM »
Where would you store a whole bunch of miscellanous stuff?
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:Encrypted object files
« on: January 20, 2004, 08:58:36 PM »
Intro
---------------
XOR stands for "exclusive or". It's a form of OR where if you have two boolean inputs, your output will be true only if one or the other inputs are true.. but NOT both. Hence the exclusive bit.
A B Out
0 0 0
0 1 1
1 0 1
1 1 0
Now if you think of A as the input and B as something you can manipulate, you might notice that the input A is inverted (ie 1->0 and 0->1) when B is set to 1. and that the input A is left alone when B is set to 0.
It's in this way that XOR can be used to invert bits in a file.
Characters
---------------
What about XOR'ing characters? like 'a' ^ 'b' or something like that. (^ is an operator in C [and possibly PHP] that XORs two characters or numbers together)
Well to the computer, 'a' and 'b' are binary sequences 1100001 and 1100010 respectively. So when you XOR them together, it'll look at each bit respectively.
so
1100001 'a' XOR
1100010 'b'
--------
0000011
You can follow the table at the top and see that only the last two binary digits will produce a 1.
"Encryption"
---------------
So what about encryption? For simple encryption, you want to be able to encrypt and decrypt to get the data back.
So if I have 'a' and XOR with 'b' you get 0000011 (as shown above) but if we XOR the answer with 'b' again:
0000011 XOR
1100010 'b'
--------
1100001 = 'a' !!!
So if you have 'a' ^ 'b' ^ 'b' you get 'a' again! This is the basis of XOR encryption in AGI object files.
The only difference is that you use a string "Avis Durgan", so you go through each character in the string you want to encrypt and XOR with 'A' for the 1st, 'v' for the 2nd and so on..
I hope this made sense!
- Nick
---------------
XOR stands for "exclusive or". It's a form of OR where if you have two boolean inputs, your output will be true only if one or the other inputs are true.. but NOT both. Hence the exclusive bit.
A B Out
0 0 0
0 1 1
1 0 1
1 1 0
Now if you think of A as the input and B as something you can manipulate, you might notice that the input A is inverted (ie 1->0 and 0->1) when B is set to 1. and that the input A is left alone when B is set to 0.
It's in this way that XOR can be used to invert bits in a file.
Characters
---------------
What about XOR'ing characters? like 'a' ^ 'b' or something like that. (^ is an operator in C [and possibly PHP] that XORs two characters or numbers together)
Well to the computer, 'a' and 'b' are binary sequences 1100001 and 1100010 respectively. So when you XOR them together, it'll look at each bit respectively.
so
1100001 'a' XOR
1100010 'b'
--------
0000011
You can follow the table at the top and see that only the last two binary digits will produce a 1.
"Encryption"
---------------
So what about encryption? For simple encryption, you want to be able to encrypt and decrypt to get the data back.
So if I have 'a' and XOR with 'b' you get 0000011 (as shown above) but if we XOR the answer with 'b' again:
0000011 XOR
1100010 'b'
--------
1100001 = 'a' !!!
So if you have 'a' ^ 'b' ^ 'b' you get 'a' again! This is the basis of XOR encryption in AGI object files.
The only difference is that you use a string "Avis Durgan", so you go through each character in the string you want to encrypt and XOR with 'A' for the 1st, 'v' for the 2nd and so on..
I hope this made sense!
- Nick
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Mega Tokyo AGI Archive / Re:NEW RELEASE: "Enclosure"
« on: January 07, 2004, 07:30:14 AM »
Has anyone played right through the game yet? If so, what did you think?
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:NEW RELEASE: "Enclosure"
« on: January 03, 2004, 07:58:46 AM »
I would like to be on the record in saying it's "not bad".
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:AGI picture format specs
« on: December 28, 2003, 08:56:54 PM »check out this site for the beta pic and sound editor:
http://visualagi.cjb.net/
you'll need .net tho.
agi specs: http://www.agidev.com/articles/agispec/agispecs.html
- Nick
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Mega Tokyo AGI Archive / Re:Help please!!!
« on: December 21, 2003, 09:40:08 AM »
site's alright... but the guy needs to update it more often.
- Nick
- Nick
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Mega Tokyo AGI Archive / Re:Ego getting stuck, and debug after restoring...
« on: December 07, 2003, 05:50:17 PM »
for the logging in problem. do you have cookies enabled? and are you logging in via www.mega-tokyo.com/forum ?
- Nick
- Nick
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