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Basic Automatic Roaming Functions
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Source: Wireless Mobile Networking with ANSI-41
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CHAPTER
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Authentication Functions
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Authentication Functions
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Part 2:
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ANSI-41 Explained
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In this chapter, we discuss the ANSI-41 mobile telecommunications network functions related to authentication These functions are divided into the following categories:1
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Shared secret data sharing Global challenge Unique challenge Shared secret data update Call-history count update Authentication reporting
We also examine the ANSI-41 application processes that support these network functions In the course of describing the processes, we identify the ANSI-41 mobile application part (MAP) operations (eg, AuthenticationRequest) used to accomplish authentication process tasks We summarize this information at the end of the chapter Note that we employ the ANSI-41 convention for operation component acronyms the Invoke component acronym is in all-capital letters (eg, AUTHREQ), while the Return Result component acronym is in all-lowercase letters (eg, authreq) Refer to the ANSI-41 standard for the descriptions of the individual ANSI-41 operations and parameters Also, consult the Glossary for a description of general terms (eg, serving system) that are not explicitly defined in this chapter Throughout this chapter we generally consider the serving system as a single entity encompassing the mobile switching center (MSC) and visitor location register (VLR) functional entities This simplifies the descriptions of ANSI-41 application processes and also is representative of a large percentage of the ANSI-41 implementations currently in service However, ANSI-41 authentication assigns specific processing duties to the VLR that make the concept of sharing a VLR among multiple MSCs a viable alternative to the combined implementation Therefore, while we describe authentication processes in terms of a single MSC plus VLR entity, keep in mind that the potential for separation exists and is fully defined in ANSI-41 Note that the ANSI-41 authentication procedures are intended to support mixed-version networks; that is, the authentication center (AC) uses ANSI-41 procedures while the serving system uses TSB51 proce-
The list of authentication functions reflects the authors subjective categorization of certain ANSI-41 functions Likewise, the process descriptions are the authors subjective interpretation of the ANSI-41 procedures
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Authentication Functions
11: Authentication Functions
dures designed for use with IS-41-B We do not discuss this aspect of ANSI-41; the reader is referred to the ANSI-41 standard for the descriptions of these backward-compatibility mechanisms Throughout this chapter we describe the authentication procedures defined in ANSI-41 Revision D (ANSI-41-D) However, we conclude with a description of the major authentication enhancements that have subsequently been standardized (ie, in TIA/EIA/IS-778 and in TIA/EIA/IS751) and will appear in ANSI-41 Revision E
What Is Authentication
Authentication is a set of functions used to prevent fraudulent access to cellular networks by phones illegally programmed with counterfeit mobile station identification (MSID) and electronic serial number (ESN) information The functions require no subscriber intervention and provide a much more robust method of validating the true identity of a subscriber than does the basic service qualification function described in the previous chapter The ANSI-41 authentication functions are independent of the airinterface protocol used to access the network, and subscribers are never involved in the process A successful outcome of authentication (ie, an authenticated MS) occurs when it can be demonstrated that the mobile station (MS) and network possess identical results of an independent calculation performed in both the MS and the network The AC is the primary functional entity in the network responsible for performing this calculation, although the serving system (ie, the VLR) may also be allocated certain responsibilities, which we shall describe The authentication calculations are based on a set of algorithms, collectively known as the CAVE (cellular authentication and voice encryption) algorithm The authentication process can be invoked by many events; however, it is performed most often when the following situations arise: 1 Registration 2 Call origination 3 Call termination Note that the authentication process is not necessary for every instance of the events listed above For example, during autonomous registration, authentication may be performed only if the subscriber has
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