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In general GSM triplet is basically tuple formed by the three GSM authentication values RAND, Kc, and SRES.
Usually they are handled by Authentication center or by the MSC.

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Posted by HamidAliKhan

On the network side the MSC/VLRS handle UMTS quintuplets for UMTS subscribers and GSM triplets for GSM subscribers. GSM authentication of UMTS ...more details visit
www.3gpp.org/FTP/TSG_SA/WG3_Security/TSGS3_04_990616London/Docs/s3-99166.doc -

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Posted by waqasahmad

GSM triplet is basically tuple formed by the three GSM authentication values RAND, Kc, and SRES.
Usually they are handled by Authentication center or by the MSC.

For details:

http://en.freepedia.org/VLR.html

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Posted by sagitraz

Hi friends,
Plz follow the links for respective answers

www.3gpp.org/FTP/TSG_SA/WG3_Security/TSGS3_04_990616London/Docs/s3-99166.doc -

telecommunicationlife.blogspot.com/2007/05/gsm2g-25g-structure-nss.html

en.wikipedia.org/wiki/Home_Location_Register

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Posted by jahangir1983