java barcode reader library open source Mobile Application Security in Android

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Mobile Application Security
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iPhone SDK
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After the initial outcry over not providing an SDK for third-party developers to write for the iPhone platform, Apple capitulated and announced the so-called AJAX SDK, which was near-universally bemoaned by developers because it provided fairly little functionality After the public response to a solely web-based application platform, Apple introduced the real iPhone SDK in March 2008 Unfortunately, Apple somewhat botched the second SDK release as well, by releasing it only to developers who paid a per-year licensing fee and accepted a draconian nondisclosure agreement (NDA) Because this agreement prevented discussion of the SDK, even with other developers, the iPhone development community largely didn t take off until October 2008, when the NDA was finally dropped (although license agreements remain in effect) iPhone SDK 30 is the current standard, and the one we cover in this chapter
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Future
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As with any Apple product, rumors abound regarding new product and functionality releases More generally, it has been speculated that the iPhone OS and Mac OS X will gradually merge in the future, as mobile hardware becomes more capable Under pressure from new contenders such as Android, Apple has implemented notification services for third-party apps as well as opened up formerly proprietary functionality (such as the iPod library access) to third-party developers
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Development
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Development for the iPhone is performed with Xcode and the iPhone SDK Code can be run either within the emulator or on a development device For some applications (for example, those using the Keychain), a physical device is required Debugging is done within Xcode via gdb, although for jailbroken devices, a third-party gdb can be installed on the device itself for debugging any phone application
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Decompilation and Disassembly
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Objective-C applications decompile fairly cleanly, if you have the right tools Many Apple developers may be familiar with otool, which comes with the OS X developer tools otool is a straightforward executable disassembler that can parse Mach-O type
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3: The Apple iPhone
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executables otool has also been ported to ARM and is available via several sources otool is very flexible; see otool(1) for details Here s a common usage:
NOTE
In Cydia, the package that includes otool is Darwin CC Tools We, of course, take no responsibility for anything bad that happens from running sketchy Cydia apps!
otool -toV /Applications/iCalapp/Contents/MacOS/iCal /Applications/iCalapp/Contents/MacOS/iCal: Objective-C segment Module 0x22b52c version 7 size 16 name symtab 0x0022c940 sel_ref_cnt 0 refs 0x00000000 (not in an __OBJC section) cls_def_cnt 1 cat_def_cnt 0 Class Definitions defs[0] 0x00204360 isa 0x0020a560 super_class 0x001a5f44 CALCanvasItem name 0x001c6574 CALCanvasAttributedText version 0x00000000 info 0x00000001 CLS_CLASS instance_size 0x0000015c ivars 0x00224300 ivar_count 13 ivar_name 0x001a54e2 _text ivar_type 0x001a53d0 @"NSMutableAttributedString" ivar_offset 0x0000012c ivar_name 0x001a54e8 _displayedTextNeedsUpdate ivar_type 0x001a5940 c ivar_offset 0x00000130 ivar_name 0x001a5502 _generalAttributes ivar_type 0x001a665c @"NSMutableDictionary" ivar_offset 0x00000134 ivar_name 0x001a66dc _fontName ivar_type 0x001a6020 @"NSString"
Mobile Application Security
ivar_offset 0x00000138 ivar_name 0x001a6034 _fontSize <and much, much more>
Try running this on several OS X or iPhone binaries using grep to search for interesting strings For current versions of the iPhone OS (verified on 30), you can use the class-dump or class-dump-x tools (http://iphonefreecoderorg/classdump_enhtml; also available in Cydia and in MacPorts for OS X) to get very readable information on class declarations and structs from Objective-C object code You have the option of either installing the iPhone binary on a jailbroken device or running the binary under OS X Because of the architectural difference between the phone and Intel Macs, you ll need to run the tool against packages compiled for the iPhone simulator From the OS X Terminal (Applications | Utilities | Terminal), you can do the following:
NOTE
For more information on using the Terminal under OS X, see http://onlampcom/pub/ct/51
class-dump-x /Developer/Platforms/iPhoneSimulator platform/Developer/ SDKs/iPhoneSimulator30sdk/Applications /MobileSafariapp < snip > protocol CALCanvasTextProtocol - (id)attributes; - (id)foregroundColor; - (float)fontSize; @end @protocol CALDetachmentDelegate - (int) decideDetachmentFor:(id)fp8 withOccurrence:(id)fp12 ; @end @protocol CALSubscribeOperationUIHandler - (BOOL)acceptHandlingOfSubscribeCreationOperation:(id)fp8; - (BOOL)handleSubscribeCreationErrorForOperation:(id)fp8; - (id)displayStringForSubscribeCreationNotification:(id)fp8; - (id)calendarIDOfSourceForOperation:(id)fp8; - (id)handleSubscribeCreationPostDownloadForOperation:(id)fp8 autoRefreshChoices :(id)fp12;
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