How to authenticate card reader? (urgent !!!)

hallo everybody,
we are working on java cards.......But we are aware from establishing secure session in between card reader and card.....
the things which we knows are 1) when card authenticates the card reader it is "External Auth"
2) when card reader authenticates the card it is "Enternal Auth."
please can anyone help me how it takes place? and the what is the actual mechanism takes place
while authentication?
* Which keys are used?
*How computation takes place?
Any regarding information is invitable.....
please....Its urgent!

This is covered in detail in the Global Platform Secure Channel Protocol 01 specifications.
1. application issues an INIT_UPDATE specifying which keyset to use
2. Card returns card-cryptogram
3. application calculates a card-cryptogram to match the card card-cryptogram using shared secret(keyset)
4. application issues an EX_AUTH with MAC'd data

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Edited by: BABU P on Jul 9, 2008 4:14 PM

Friends,
I am able to read the the credit card details ,
my next question is, How to activate the PAYMENT program to send credit card details to the 3rd party system .
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Logon     Connection Error
Error Details     Error when opening an RFC connection
Error Details     ERROR: program paycard not registered
Error Details     LOCATION:
Error Details     DETAIL: TP paycard not registered
Error Details     COMPONENT: SAP-Gateway
Error Details     SUBRC: 0
Error Details     RELEASE: 700
Error Details     TIME: Wed Jul 23 14:47:38 2008
Error Details     VERSION: 2
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Thankyou !!!!! Its worked ! Was going to cost me a lot just to have it looked at without anything being done ..... I cannot believe how simple this was

How to authenticate card reader? (urgent !!!)

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