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I want to implement PAP and CHAP based authentication in my Java project how can I implement ? is there any API available in Java for using that protocol ?

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Warning: PAP and CHAP have security problems. If you're forced to use them by a legacy system you have to interoperate with, well, so be it -- but if you're building a new system and have the choice, I do not recommend their use. It is better to use TLS. – D.W. Feb 24 '12 at 6:55
What is TLS ? and please elaborate that how should I use that ? – NullPointerException Feb 25 '12 at 4:35
Thanks for your interest, Bhavik! Allow me to point out the "Search" bar in the upper-right on this site. It is sometimes useful in answering questions like yours. For instance, here's the second result for a search for "what is TLS?" on this site: What's the difference between SSL, TLS, and HTTPS?. And the first result for a search on "TLS" on Wikipedia also gives good information: Transport Layer Security. – D.W. Feb 25 '12 at 5:48
Thans for the details, now the question is how can I implement that thing in my java project ? Have you ever implemented this things ? – NullPointerException Feb 25 '12 at 6:01
sorry, but this is the wrong place to ask that question: it is probably out of scope for this site. A web search should turn up plenty of information about how to implement TLS. Try searching on Stack Overflow, too (hint: try a search on adding TLS on Stack Overflow). – D.W. Feb 25 '12 at 6:16

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This may be what you're looking for:

http://tinyradius.sourceforge.net/

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