digital signatures amp authentication protocols

... this example, it is hard for B to forge (x,y) and hence if (x,y) verifies A can be sure that data came unaltered from the sensor RSA Signatures  The treaty example is an example of RSA signatures ... forge and use elsewhere  Conventional signing can’t work in the digital world  We require a digital signature to satisfy: Digital signatures can’t be separated from the message and attached to ... theory (quickly) – DLOG – ElGamal, another Public Key Algorithm…  Digital Signatures: – The basic idea – RSA Signatures and ElGamal Signatures – Inefficiencies: Hashing and Signing  Hash Functions:...

Ngày tải lên: 15/03/2014, 17:20

... certificate, use Import/Export to install your digital ID If you need a digital signature, choose Get a Digital ID This opens your Internet browser to a list of digital ID providers who partner with Microsoft ... Set Up a Digital Signature Before you can use a digital signature, it must be installed and set up in Outlook Open the Tools, Options, Security dialog If you already have a current digital certificate, ... digital certificate to her contact record Confirm that the digital signature was added to the contact by looking on the contact's Certificates tab (see Figure 8.8) Figure 8.8 Your contact's digital...

Ngày tải lên: 21/01/2014, 02:20

... certificate, use Import/Export to install your digital ID If you need a digital signature, choose Get a Digital ID This opens your Internet browser to a list of digital ID providers who partner with Microsoft ... Set Up a Digital Signature Before you can use a digital signature, it must be installed and set up in Outlook Open the Tools, Options, Security dialog If you already have a current digital certificate, ... digital certificate to her contact record Confirm that the digital signature was added to the contact by looking on the contact's Certificates tab (see Figure 8.8) Figure 8.8 Your contact's digital...

Ngày tải lên: 21/01/2014, 02:20

Ngày tải lên: 24/01/2014, 19:20

Ngày tải lên: 02/08/2014, 08:21

Ngày tải lên: 11/08/2015, 18:49

... kiểm tra tính hợp lệ giao dịch thực môi trường điện tử dựa công nghệ xác thực nhiều yếu tố Digital Authentication Công ty Hệ thống thông tin FPT (FPT-IS)  One Time Password  Biometric  Hạ ... workshop Page Tổng quan CA Yêu cầu Case Study Giải pháp FPT Dễ đoán Dễ dàng bị đánh cắp Traditional Authentication method Khó nhớ Ghi giấy Công ty Hệ thống thông tin FPT (FPT-IS) Dễ bị bẻ khóa PKI...

Ngày tải lên: 12/11/2015, 16:15

Ngày tải lên: 21/08/2012, 16:18

Ngày tải lên: 24/08/2012, 21:11

... image 298 A Smart Object layer can be resized indefinitely without losing resolution due to resampling Any filter applied to a Smart Object is a Smart Filter Smart Filters appear in the Layers ... Because you can adjust, remove, or hide Smart Filters, they are non-destructive Adobe Photoshop CS5 Digital Classroom Lesson 11 What you’ll learn in this lesson: • • • • Working with filters Fading ... You can keep this file open for reference, or choose File > Close to close it Adobe Photoshop CS5 Digital Classroom 11 Starting to use filters Using the Clouds filter In this lesson, you will use...

Ngày tải lên: 27/08/2012, 09:58

... 163 Retouching images 165 Using the Clone Stamp tool 166 Repairing fold lines 167...

Ngày tải lên: 27/08/2012, 11:20

... change As a digital film-maker, you don’t have to worry about such problems and, in most cases, you can have your software create a matte for you automatically But best of all, your digital mattes ... comfortable with the concept For example, try using the Photoshop Gradient tool to create text that fades from full opacity to full transparency (see Figure 16.20) 393 DIGITAL FILMMAKING HANDBOOK 394 ... re-render both clips (and possibly your entire movie) so that every clip will be subject to the same clamping If you apply a 1-pixel crop to each clip, then the computer will be forced to rerender everything...

Ngày tải lên: 28/08/2012, 08:55

... nhỏ đâu cần edit, chụp in y chang tài tử ciné Nói thực máy ảnh digital camera ngày cho ảnh xuất sắc ngang ngửa nhóm Trong 57 máy digital camera nhỏ xíu bên trên, bạn thấy hầu hết image quality ... trên, bạn thấy hầu hết image quality cho trung bình Số cho ảnh trung bình nhỏ hơn, không thấy máy digital camera nhóm cho ảnh tệ Việc bạn hỏi mua máy ảnh chắn máy cho ảnh rõ không? Và câu thứ hai ... ngang với nhóm subcompact mà Đây nhóm máy ảnh dành cho bạn thích có optical zoom to (bỏ qua bên digital zoom đi, vô ích) Nhóm nầy có máy có optical zoom tới 20x, 8x Về image quality ngang ngang...

Ngày tải lên: 07/09/2012, 11:11

... -0.113940 x[n] newest sample 20044 -0.113940 x[n-1] -0.048679 x[n-7] oldest sample 20045 -0.062222 x[n] 20045 newest sample 20046 -0.222977 x[n-6] 20046 -0.222977 x[n-7] oldest sample 20047 -0.371370 ... instant in time (a), and how it would appear one sample later (b) of samples, perform the algorithm, and output a group of samples This is the world of Digital Signal Processors Now look back at Fig ... for example: address 20043 contains one sample, address 20044 contains the next sample, and so on This is frequently not the case For instance, the addressing may refer to bytes, and each sample...

Ngày tải lên: 13/09/2012, 09:50

... Normal Distribution 26 Digital Noise Generation 29 Precision and Accuracy 32 Chapter ADC and DAC 35 Quantization 35 The Sampling Theorem 39 Digital- to-Analog Conversion ... Legal Information: Warning and Disclaimer This book presents the fundamentals of Digital Signal Processing using examples from common science and engineering problems While the author believes that ... 225 Chapter 13 Continuous Signal Processing 243 DIGITAL FILTERS Chapter 14 Introduction to Digital Filters 261 Chapter 15 Moving Average Filters...

Ngày tải lên: 13/09/2012, 10:21

... Filter x(t) Sample and Hold ADC Digital Signal Processor DAC 23 Analog Analog Low Pass Output Filter y(t) Figure 1.17 Example of a digital signal processing system 1.5 ANALOG AND DIGITAL SIGNAL ... the next sampling takes place The DT signal so generated by the ZOH is shown in Figure 1.3, in which the value of the sample value during each period of sampling is a constant; the sample can ... expressing the sample values as elements of a set, when the sequence has a finite number of samples For example, in a sequence x1 (n) as shown below, the arrow indicates the value of the sample when...

Ngày tải lên: 13/09/2012, 10:21

Ngày tải lên: 13/09/2012, 10:51