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by: James Cha

TINFO444Week31Notes.pdf TINFO444

James Cha
GPA 3.59
Mobile Digital Forensics I
John Bair

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About this Document

Notes taken on Tuesday, January 20th. Taken directly from the textbook, lecture, and PowerPoint so it is credible, accurate information.
Mobile Digital Forensics I
John Bair
One Day of Notes
25 ?




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This 4 page One Day of Notes was uploaded by James Cha on Friday January 23, 2015. The One Day of Notes belongs to TINFO444 at University of Washington taught by John Bair in Winter2015. Since its upload, it has received 95 views. For similar materials see Mobile Digital Forensics I in Information technology at University of Washington.

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Date Created: 01/23/15
T INFO 444 Week 3 January 20th CHAPTER 3 KNOW THESE TERMS 0 Code Division Multiple Access CDMA O Refers to a type of communication protocol used in a wireless cellular network 0 Global Systems for Mobile Communications GSM 000 Originated in Europe an international standard Older than CDMA Used a digital system with TDMA GSM phones use SIM cards 0 International Mobile Equipment Identity IMEI O O O A unique 15 digit number given to cell phones Usually affixed to the phone on the label under the battery IMEI is the unique way a cellular phone may be identified on the GSM network 0 Integrated Circuit Card Identifier ICCID O O A 20 digit identifying number contained in a SIM card First two digits represent the Major Industry Identifier MII followed by the Country Code 13 digits then followed by the individual account identification number and the last digit is the check digit ICCID is basically the serial number on a SIM card 0 Subscriber Identification Module SIM O A small wafer sized card that contains its own ICCID 0 International Mobile Subscriber Identity IMSI O O Identifies the actual user or subscriber of the wireless network Length can be up to 15 digits First 3 digits is the Mobile Country Code MCC then 23 digits for the Mobile Network Code M NC and the last remaining digits make up the Mobile Subscription Identification Number MSIN o IMSI is basically the value that identifies the subscriber on a network 0 Mobile Station MS 0 Represents the actual user equipment that is the basis for making a cellular phone call 0 Base Transceiver Station BTS 0 Contains the transceiver that handle the protocols of the Mobile Equipment 0 Once a call is generated from the Mobile Station it goes directly to the Base Transceiver Station 0 Base Station Controller BSC 0 Handles the radio resources for one or more of the BTS s o Handles radio channel set up frequency hopping and handoffs 0 Mobile Switching Center MSC o Conducts various call functions such as I Rou ng I Communication switching I Call set up I Release 0 Can execute many otherjobs such as I Rou ng I SMSMMS Text messages multimedia messages I Internet requests I Sending calls to the Public Switched Telephone Network PSTN o The MSC is basically like a router 0 Home Location Registry HLR o HLR is a database that contains I Subscriberinformation I IMSI I Phone number I ICCID value I Services that have been paid for I Account status I Preferences o The wireless carrier maintains the HLR 0 Visitor Location Registry VLR 0 Contacts the MSC which in turn looks into the HLR for processing the call when a user of a cellular device is out of the service area for the HLR 0 Contains IMSI Phone number Services allowed Current location of the device TMSI Other preferences 0 There can be many VLR s but ONLY ONE HLR o Authentication Center AUG 0 A database that handles Encryption keys Authentication 0 SIM cards are assigned their own Authentication Key Ki and the AuC has to match this key 0 AuC s intention is to keep the Ki from being readable by the user which in turn protects against Cloning Fraud Other criminal endeavors 0 Equipment Identity Registry EIR o Maintains phones by their IMEI as to who can be provided service on the network 0 Maintains white gray and black listed phones White the phone is valid for service Gray the phone is under observation Black the phone is stolen o EIR can be proprietary to the network providing service 0 Temporary Mobile Subscriber Identity TMSI 0 Given to devices that are out of the HLR area 0 Value will constantly change as the device travels o Assists with security and aids the base station with locating the device Public Switch Telephone Network PSTN o Primarily used to route a call out of the network 0 Includes calls to I Payphones I Landlines 0 Calls made cellular to cellular do NOT utilize the PSTN to complete the call REVIEWPRACTICE THIS INFORMATION 1 10 These two main items typically make up the Mobile Station Cellular Device and SIM card CDMA is newer than GSM devices The Equipment Identity Registry EIR Black Area is the area during a cellular call when it is checked for being stolen Cellular phones are NOT part of the Mobile Switching Center MSC A user will NOT have Multiple Home Location Registries HLR After a cellular call travels through the Base Transceiver Station BTS it is routed to the Base Station Controller Cellular to cellular calls does NOT require the use of the Public Switched Telephone Network PSTN A Temporary Mobile Subscriber Identity TMSI is NOT one of the stored items of the Home Location Registry HLR The Authentication Center AuC is the portion of the network that handles encryption and authentication The IMSI and ICCID are some of the components stored on a SIM card The IMSI contains the subscriber information while ICCID acts as the serial number for the SIM card


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