những mẹo an toàn cho thiết bị bluetooth

... với thiết bị kết nối với nhau, laptop PC với Mobilephone Giới hạn thiết bị Piconet (3 bit MAC cho thiết bị) Tất thiết bị Bluetooth ngang hàng mang chức xác định Tuy nhiên thành lập Piconet, thiết ... SCO thiết lập sau liên kết ACL thiết lập 2.1.6 Trạng thái thiết bị Bluetooth: Có trạng thái thiết bị Bluetooth piconet: _ Inquiring device (inquiry mode): thiết bị phát tín hiệu tìm thiết bị Bluetooth ... Trojan 125 3.2.3.18 Skulls – A 126 3.2.3.19 Skulls- B 128 3.3 Các giải pháp an toàn bảo mật sử dụng công nghệ mạng Bluetooth 129 3.3.1 Những mẹo an toàn cho thiết bị...

Ngày tải lên: 12/08/2014, 10:20

... Thái An – Trần Thị Mỹ Hạnh 128 Tìm hiểu công nghệ Bluetooth viết ứng dụng minh họa 3.3 Các giải pháp an toàn bảo mật sử dụng công nghệ mạng Bluetooth 3.3.1 Những mẹo an toàn cho thiết bị Bluetooth: ... làm cho thiết bị Bluetooth sử dụng pin nhiều năm QoS cải thiện vấn đề địa thiết bị Đây nhu cầu để nhiều thiết bị Bluetooth kết nối hoạt động lúc với mà không bị trễ hay nhiễu Với QoS, thiết bị ... Số thiết bị active, pack lúc piconect hạn chế • Tốc độ truyền Bluetooth không cao • Bị nhiễu số thiết bị sử dụng sóng radio khác, trang thiết bị khác • Bảo mật thấp 4.3 Tầm ứng dụng tương lai Bluetooth...

Ngày tải lên: 12/08/2014, 10:20

... socket UDP không cho phép điều này; ta phải làm việc với gói tin Tất liệu đặt datagram gửi dạng gói tin Gói tin nhận nhóm bị Một gói tin không thiết phải liên quan đến gói tin Cho trước hai gói ... void main(String[] args) { try { UDPServer server=new UDPEchoServer(); server.start(); System.out.println("Server dang da san sang lang nghe lien ket "); } catch(SocketException e) { System.err.println(e); ... UDP thiết kế tồi làm giảm băng thông mạng 1.4 Các ưu điểm UDP  Không cần thiết lập liên kết UDP giao thức phi liên kết, không cần phải thiết lập liên kết Vì UDP không sử dụng tín hiệu handshaking,...

Ngày tải lên: 02/10/2013, 21:20

... [UIView beginAnimations:nil context:NULL]; [UIView setAnimationDuration:1]; [UIView setAnimationTransition:([mainView superview] ? UIViewAnimationTransitionFlipFromRight : UIViewAnimationTransitionFlipFromLeft) ... First, Second, and Third, rather than providing any useful clue as to a button’s purpose You can change three things on each button to improve their usability: the icon, the title, and the badge ... by Apple while only managing the responses You get the advantage of lots of programming (and a standardized interface), and you don’t have to much yourself Whenever you want to display a modal...

Ngày tải lên: 18/10/2013, 00:15

... you’re dynamically changing your image If you want to create a set of images to animate, it’s useful to take advantage of the other UIImageView methods and properties You can load an array of images ... other than the whole screen You can even layer multiple images by using multiple UIImageViews This all starts to get unwieldy pretty quickly, though, and you can’t anything fancier, like transforming ... properties and methods of note for UIImageView Method or property Type Summary animationDuration Property Specifies how often an animation cycles animationImages Property Identifies an NSArray...

Ngày tải lên: 24/10/2013, 18:15

... addAnimation:opAnim forKey:@"animateOpacity"]; CGAffineTransform moveTransform = CGAffineTransformMakeTranslation(200, 200); CABasicAnimation *moveAnim = [CABasicAnimation animationWithKeyPath:@"transform"]; ... animationWithKeyPath:@"transform"]; moveAnim.duration = 6.0; moveAnim.toValue= [NSValue valueWithCATransform3D: CATransform3DMakeAffineTransform(moveTransform)]; [plane.layer addAnimation:moveAnim forKey:@"animateTransform"]; ... opacity, position, transform, and several others This means that you can use Core Animation to animate the position of an object, its color, its transparency, and also its CGAffine transformations Before...

Ngày tải lên: 24/10/2013, 18:15

... you can with an NSURLRequest You can hand it off to a UIImageView, or you can use it to read in the contents of a web page, to later manipulate it by hand 20.3.3 Manipulating HTML data by hand ... initWithString:relativeToURL: 400 CHAPTER 20 The web: web views and internet protocols Once you’ve got an NSURL in hand, you can any number of things with it: ■ ■ ■ You can pass it on to functions that require a bare ... (Extensible Markup Language) is a generalized markup language whose main purpose is to deliver data in a well-formed and organized way It has some similarities to HTML, and an XML version of HTML...

Ngày tải lên: 29/10/2013, 01:15

... Data that can be changed NSMutableDictionary NSDictionary A dictionary that can be changed NSMutableSet NSSet A set that can be changed NSMutableString NSString A string that can be changed NSMutableURLRequest ... important object for debugging; logs a formatted string to the system log NSMutableArray NSArray An array that can be changed NSMutableCharacterSet NSCharacterSet A character set that can be changed ... member can just create a CSR, download a certificate, and download a provisioning profile From that point, the member can choose to compile onto a device rather than to the iPhone Simulator by changing...

Ngày tải lên: 29/10/2013, 01:15

... can be set by hand as part of a web page design, forcing a page to scale either more or less when it’s translated onto the iPhone However, for any web page without an explicit viewport command, ... Passwords and other connection details are saved on the iPhone, which automatically reconnects to a known network whenever it can Switches to and from local wi-fi networks are largely transparent and ... uses the Bluetooth 2.0+EDR protocol Enhanced Data Rate (EDR) allows for a transmission rate about triple that of older versions of Bluetooth (allowing for a 3.0 Mbit/s signaling rate and a practical...

Ngày tải lên: 21/01/2014, 23:20

... tool for the job at hand 2.3 Advantages and disadvantages Each of the web and SDK development models has its own advantages and disadvantages We’ve summarized the biggest advantages for each model ... from the iPhone App Store, and thus it’s a great way to attract many more users Dynamism Hand in hand with that is the fact that you can literally update your program at any time You don’t have ... iUI, and Canvas We hope you’ll keep reading from there, as our material on the SDK is all quite introductory, and even if you’ve never worked with a compiled programming language, you can use...

Ngày tải lên: 21/01/2014, 23:20

... ways to change it First, any web page served on a mobi domain and any web page containing mobile XHTML markup automatically uses an alternative default viewport of 320 pixels Second, you can purposefully ... nothing official In the meantime, the WebKit and Canvas offer some weak alternatives for animation, as described in chapters and Java Sun announced plans to support Java on the iPhone in 2008, ... iPhone: drags and hovers Thus, you can no longer allow click and drag (because the iPhone instead uses that gesture for its scrolling) and you can no longer test when the mouse moves over an area (because...

Ngày tải lên: 21/01/2014, 23:20

... stuff, starting with a variety of advanced CSS methods that you can use to manipulate and animate the content of your web page 4.2 CSS transforms, transitions, and animations One of the most innovative ... 30 degrees and tion that we’re going to talk about translated percent along each of the X and Y axes 61 CSS transforms, transitions, and animations 4.2.2 The transition function A transition is ... about transitions is that they can be used with that other new WebKit feature we just discussed: transforms TRANSITIONING TRANSFORMS By putting together transforms and transitions, you can create...

Ngày tải lên: 21/01/2014, 23:20

... Ajax stands for Asynchronous JavaScript and XML It’s a technology that can be integrated into web pages, but it’s more a set of techniques than an actual language It combines JavaScript and XML ... and row (see listing 5.7) These classes are meant to mimic the Settings page found on your iPhone, with its rows of options that you can change Listing 5.7 Panels, rows, and toggles forming another ... being labeled ON and OFF, but you can modify that however you want The toggle class is managed by an onclick JavaScript event handler The example includes return;, but you’ll want to instead call...

Ngày tải lên: 21/01/2014, 23:20

... functionality You’ll probably want to use a nice PNG-24 image, which is a great choice to use with Canvas because it supports transparency and an 8-bit alpha channel, meaning that you can put these images ... the rhombus angle, with the result being an animated rhombus that starts off as a square (angle = π radians) and then collapses down toward a line (angle = 5π radians) Clearly, other animations ... to change There’s still a bit more that you can to modify your shapes and lines: you can choose not to show some of them 6.5 Modifying composition and clipping You can make your shapes and lines...

Ngày tải lên: 26/01/2014, 18:20

... ABOUT THE CANVAS Dashcode’s development canvas is the right panel of the main page It’s simple and easy to use You can manipulate graphical objects there by dragging them around, and the canvas will ... individual Dashcode objects which can be of relevance when the iPhone’s orientation changes and the size of the objects need to change Text —Changes fonts, colors, spacing, and other text-related settings ... Dashcode canvas Adjust the gauge Pop up an inspector window and click on the Attributes tab In the Values section, change the range to go from to 359, to allow the full range of values Change the...

Ngày tải lên: 26/01/2014, 18:20

... can have a fully featured desktop browser sitting next to an iPhone Simulator With the first, you can easily look at source and use any number of development tools, and with the second you can ... functions, a variety of validators, and a lot Figure 8.2 Firefox (left) and Safari (right) both include JavaScript error consoles that you can use to debug Canvas and any other JavaScript work you’re ... them and what they mean is as important to writing iPhone code as the actual features and functions we’ve been discussing An always-on internet is the thing that allows us to write web apps, and,...

Ngày tải lên: 26/01/2014, 18:20

... they support inheritance That means that you can subclass an existing class Your subclass starts off with all the default variables and methods for its parent class, but you can now supplement ... whatever language you’re familiar with However, it may vary from your web language of choice in how it deals with some big-picture areas, such as declarations, memory management, file structure, and ... teach you how to program in C If you want more information on that, the definitive reference is The C Programming Language, Second Edition, by Brian W Kernighan and Dennis M Ritchie (Prentice Hall,...

Ngày tải lên: 26/01/2014, 18:20

... Sometimes you’ll want to send an argument with an init You can so with an initialization function that you name using the format initWithArgument: Other than the fact that you’re sending it an argument, ... other new element: we’ve started it with a – That means that this is an instance method, which is a method that can only be used by an instance object Its opposite number, which is marked with ... First, you allocate memory for the object, and then you initiate any variables and perform any other setup The precise manner in which this is done can vary from class to class It’s usually a...

Ngày tải lên: 26/01/2014, 18:20

... you can so in one of three ways You can just click the program’s button, which should now appear in your Simulator Or, you can choose Run > Run from within Xcode Finally, you can choose Build and ... program are all pretty simple and standard First, you connect your label and your window by using the window’s addSubview method F This is a standard (and important!) method for adding views ... useful elements, in particular an Errors and Warnings item that you can click open to quickly see any problems in your compilation The top-right pane contains an ungrouped list of files used by your...

Ngày tải lên: 26/01/2014, 18:20

... position of an object Figure 12.5 shows the options you can change here This tab leads off with values for size and position Not only can you change an object’s starting point, but you can also define ... but you can choose File > Simulate Interface, which mocks up all your Interface Builder objects, but without any additional Xcode work That can sometimes be useful, but more often you’ll want to ... Builder: pictures and the web 211 You can now either manipulate these objects in Interface Builder or create IBOutlets to manipulate them in Xcode We’ll look at Interface Builder manipulations first,...

Ngày tải lên: 26/01/2014, 18:20