METHOD FOR HANDLING CIPHER KEY IN MOBILE STATION

Japanese Patent JP2015015754

A

PROBLEM TO BE SOLVED: To handle cipher keys in a mobile station including mobile equipment (ME) and a Universal Subscriber Identity Module (USIM).SOLUTION: A method includes the steps of: obtaining a UMTS cipher key (CK), an integrity key (IK), and a cipher key sequence number (CKSN) from a USIM; deriving a 128-bit cipher key (Kc-128) from the CK and the IK; and storing the Kc-128 and the CKSN in the mobile equipment separately from the USIM. The stored CKSN is associated with the stored Kc-128 so that the Kc-128's correspondence to the most current UMTS security context can be tracked. The method is applied to the generation and storage of the 128-bit cipher key for either the packet-switched or circuit-switched domains.

JP2013197659	PORTABLE INFORMATION TERMINAL
JP6839466	Telephone system
JP4594401	Voice mobile communication device

CHRISTIAN HERRERO VERON
MONICA WIFVESSON

JP2014182468A

January 22, 2015

September 08, 2014

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ERICSSON TELEFON AB L M

H04M1/00; H04L9/08; H04W12/02; H04W12/04; H04W92/08

JPN7014001957; Ｄｉｇｉｔａｌ　ｃｅｌｌｕｌａｒ　ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ　ｓｙｓｔｅｍ　（Ｐｈａｓｅ　２＋）；　Ｕｎｉｖｅｒｓａｌ　Ｍｏｂｉｌｅ　Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ　Ｓｙｓｔｅｍ　（Ｕ , 200907, ｐｐ．　２２-２６，　５６
JPN7014001955; Ｅｒｉｃｓｓｏｎ，　ＳＴ-Ｅｒｉｃｓｓｏｎ: 'Ｄｅｒｉｖａｔｉｏｎ　ｏｆ　Ｋｃ１２８　ｗｉｔｈ　ＵＭＴＳ　ＡＫＡ［ｏｎｌｉｎｅ］' ３ＧＰＰ　ＴＳＧ　ＳＡ　ＷＧ３　Ｓｅｃｕｒｉｔｙ　-　Ｓ３＃５６　　Ｓ３-０９１５２０ , 20090710, ｐｐ．　１-１８
JPN7014001956; Ｄｉｇｉｔａｌ　ｃｅｌｌｕｌａｒ　ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ　ｓｙｓｔｅｍ　（Ｐｈａｓｅ　２＋）；　Ｕｎｉｖｅｒｓａｌ　Ｍｏｂｉｌｅ　Ｔｅｌｅｃｏｍｍｕｎｉｃａｔｉｏｎｓ　Ｓｙｓｔｅｍ　（Ｕ , 200907, ｐｐ．　４９，　５４，　７０

Yasunari Otsuka
Shiro Takayanagi
Yasuhiro Otsuka
Hideji Kimura
Shimoyama 治
Takahiro Sakata

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