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urgent help on java security needed

 
scott simon
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hi, people, i'm a rookie here, if moderator doesn't think it fits in here, please advise me which forum I should post this.
I'm doing a java based chatroom with security. my questions are:
1. assuming A, B, C, D login, then there are 6 possible pairs. if each pair has to get a pair of keys so that only that pair can read the msg (ie. C can't read msgs b/w A & B). how do I generate the keys? How can the keys be managed? i'm very confused on this
2. the problem gets more confusing to me when I don't make the above assumption--ie it's an open chatroom, anyone can register and login at any time generate keys every time when you login?
what about when you talk to 3 people at same time?
3 different pair of keys?
3. every one has the option to send ciphered or plain text/files, when you send ciphered ones, only the one with key can read it, it should show up as messy codes to others attempt to read it. how should I implement this?
Thank you all in advance for any suggestions.
 
Rob Ross
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wait, how urgent is it?
Is it really really urgent? or just a little bit urgent?
 
scott simon
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really urgent, dude, any one out there can help me out thanx a bunch
 
I agree. Here's the link: http://aspose.com/file-tools
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