chapter 4  data security and storage

... Data Security and Encryption (CSE348) Lecture # 4 Review – classical cipher techniques and terminology – Brute Force • Cryptanalysis of Brute ... count relative letter frequencies (see text) guess P & Z are e and t guess ZW is th and hence ZWP is the proceeding with trial and error finally get: it was disclosed yesterday that several informal ... each letter is replaced by the letter in the same row and in the column of the other letter of the pair 17 Security of Playfair Cipher  security much improved over monoalphabetic  since have

Ngày tải lên: 20/09/2020, 13:57

... to a string and formats it. • Left(), Right(), and Mid() Trang 19McGraw Hill/Irwin ©2002 by The McGraw-Hill Companies, Inc All rights • LTrim(), Rtrim(), and Trim() – Remove leading and trailing ... evaluating expressions • String expressions consist of string constants and variables and string operators and functions • Chr() and Asc() are used with strings to access the ANSI table • Logical ... used to create arithmetic, string, and logical expressions • Explain why errors occur and how to avoid them • Write logical expressions using comparison operators and logical operators Trang 44.1

Ngày tải lên: 16/05/2017, 14:41

... OutlinePart Seven: Legal and Ethical Issues:  Deals with the legal and ethical issues related to computer and network security. Trang 11Course OutlineChapter 1 Overview 1.1 Computer Security Concepts 1.2 The OSI Security ... Security Architecture 1.3 Security Attacks 1.4 Security Services 1.5 Security Mechanisms 1.6 A Model for Network Security 1.7 Recommended Reading and Web Sites 1.8 Key Terms and Review Questions ... Recommended Reading and Web Sites 15.7 Key Terms and Review Questions Trang 26Course OutlinePART FIVE NETWORK AND INTERNET SECURITY Chapter 16 Transport-Level Security 16.1 Web Security Issues

Ngày tải lên: 20/09/2020, 13:56

... to detect, prevent, or recover from a security attack.  29 Trang 30Aspects of Security• Security service: A processing or  communication service that enhances the  security of the data processing systems and the information transfers of an organization.  ... system 26 Trang 28Aspects of Security• Security attack: Any action that compromises the security of information owned by an  organization.  28 Trang 29Aspects of Security• Security mechanism: A process (or a device incorporating such a process) that is designed  ... Instead, the goal is to detect active attacks and to  recover from any disruption/or delays caused by  them.Trang 37Security Service– enhance security of data processing systems and  information transfers of an organization

Ngày tải lên: 20/09/2020, 13:56

... 1(CSE348) Trang 2Lecture # 3Trang 3• Security concepts: – confidentiality, integrity, availability • Security attacks, services, mechanisms • Models for network (access) security • Classical Encryption ... various common key sizes Trang 8brute-Brute Force Search• Data Encryption Standard(DES) is 56 • Advanced Encryption Standard (AES) is 128 • Triple-DES is 168 Trang 9Brute Force Search• always ... million keys per microsecond • And this performance level, DES can no longer be considered computationally secure. Trang 14Classical Substitution Ciphers• In this section and the next, we examine

Ngày tải lên: 20/09/2020, 13:57

... complete security but, in practice, has two fundamental difficulties: • There is the practical problem of making large quantities of random keys • And the problem of key distribution and protection ... needed by both sender and receiver • Because of these difficulties, the one-time pad is of limited utility, and is useful primarily for low-bandwidth channels requiring very high security • The one-time ... shown, cryptanalysis is fairly straightforward  and involves laying out the ciphertext in a matrix and playing around with column positions  Digram and trigram frequency tables can be useful 33

Ngày tải lên: 20/09/2020, 13:57

... techniques and terminology – monoalphabetic substitution ciphers – cryptanalysis using letter frequencies Trang 4Chapter 3 Block Ciphers and the Data Encryption Standard Trang 5Block Ciphers and the ... Trang 17Claude Shannon and Trang 18Claude Shannon and Substitution-Permutation Ciphers  In particular, Feistel proposed the use of a cipher that alternates substitutions and permutations  as ... product cipher  He also introduced the ideas of confusion and diffusion, notionally provided by S-boxes and Trang 20P-Claude Shannon and Substitution-Permutation Ciphers  Claude Shannon introduced

Ngày tải lên: 20/09/2020, 13:58

... Data Security and Encryption (CSE348) Lecture # 7 Review • have considered: – block vs stream ciphers – Feistel cipher design & structure Data Encryption Standard (DES) • most ... although DES standard is public • was considerable controversy over design – in choice of 56-bit key (vs Lucifer 128-bit) – and because design criteria were classified • subsequent events and public ... using a left circular shift and a permutation of the two 28-bit halves Initial Permutation IP • The initial permutation and its inverse are defined by Tables 3.2a and 3.2b • The tables are to

Ngày tải lên: 20/09/2020, 13:58

... Cryptanalysis  Each round of DES maps the right-hand input into the left-hand output  Sets the right-hand output to be a function of the left-hand input and the subkey for this round  which means ... Data Security and Encryption (CSE348) Lecture # 8 Review – Data Encryption Standard (DES) – DES Encryption – Initial Permutation IP – DES ... to result in random-looking changes to the output • The relationship should be nonlinear and difficult to approximate with linear functions • A final area of block cipher design, and one that

Ngày tải lên: 20/09/2020, 13:58

... Encryption Standard (AES) • Published by NIST (National Institute of Standards and Technology) in 2001 • AES is a symmetric block cipher • That is intended to replace DES as the approved standard for ... using a left circular shift and a permutation of the two 28-bit halves Trang 7Initial Permutation IP• The initial permutation and its inverse are defined by Tables 3.2a and 3.2b • The tables are ... evaluation process and published a final standard (FIPS PUB 197) in November of 2001 • NIST selected Rijndael as the proposed AES algorithm • The two researchers who developed and submitted Rijndael

Ngày tải lên: 20/09/2020, 13:59

... Data Security and Encryption (CSE348) Lecture # 10 Review – The AES selection process – The details of Rijndael ... encryption and decryption is the same 44 AES Decryption • This has the disadvantage that two separate software or firmware modules are needed for applications • That require both encryption and decryption ... AES Decryption • Clearly swapping the byte substitutions and shift rows has no effect, since work just on bytes • Swapping the mix columns and add round key steps requires the inverse mix columns

Ngày tải lên: 20/09/2020, 13:59

... formats and data standards Different formats were implemented by different GIS vendors; different standards come about with different standardization committees The good news about both formats and ... 84/167 Chapter Data entry and preparation ERS 120: Principles of Geographic Information Systems and δf/δy Here, f stands for the elevation field as a function of x and y, and δf/δx, for instance, ... describe the geometry and behaviour of moving and stationary objects on and near the surface of the Earth Figure 4.4: (a) The International Terrestrial Reference System (ITRS), and (b) the International...

Ngày tải lên: 21/10/2014, 10:09

... with 25 molecules of O2 to form 16 molecules of CO2 and 18 molecules of H2O moles of C8H18 react with 25 moles of O2 to form 16 moles of CO2 and 18 moles of H2O mol C8H18 : 25 mol O2 : 16 mol ... McGraw Hill O + H H O + O H H 11 Limiting and Excess Reactants in the Combustion of Methane CH4(g) + O2(g) → CO2(g) + H2O(g) • If we have molecules of CH4 and molecules of O2, which is the limiting ... Yield, and Percent Yield Example: • When 28.6 kg of C are allowed to react with 88.2 kg of TiO2 in the reaction below, 42.8 kg of Ti are obtained Find the Limiting Reactant, Theoretical Yield, and...

Ngày tải lên: 28/11/2013, 01:11

... right, and the height by subtracting the top from the bottom On the main monitor, the left and top fields of the BRect returned by Frame() are 0, so the right and bottom fields provide the width and ... window’s: • Size and screen placement • Title • Type or look • Behavioral and peripheral elements The BWindow constructor prototype, shown here, has four required parameters and an optional fifth ... parameters (look and feel) in place of the one type parameter discussed above The separate look and feel parameters provide a means of more concisely stating just how a window is to look and behave...

Ngày tải lên: 26/01/2014, 07:20

... Operating Systems and File Management 19 Handheld Operating Systems Chapter 4: Operating Systems and File Management 20 SECTION File Basics C File Names and Extensions File Directories and Folders ... Systems and File Management 31 File Management Metaphors Storage metaphors help you visualize and mentally organize the files on your disks – Logical storage models Chapter 4: Operating Systems and ... “empty” sectors with random 1s and 0s Files in the Windows Recycle Bin and similar utilities can be undeleted Chapter 4: Operating Systems and File Management 40 Physical File Storage Fragmented...

Ngày tải lên: 06/03/2014, 09:21

... 22 © 2009 Windows Common Dialog Boxes (dlg prefix) • Predefined standard dialog boxes for: – – – – File Open and Saving Printing and Previewing Color selection Font selection • Add the Common Dialog ... tip p 204) • Enabled, True/False • Visible, True/False 4- 16 © 2009 Menu Design Standards • Follow the industry standards for Windows for names, order/location, access keys, shortcut keys • Basic ... Information • Code must be written to retrieve and use the choices made by the user in the Common dialog • Example – Color Dialog displayed – User selects color and clicks OK – Code must be written to...

Ngày tải lên: 13/05/2014, 11:31

... multiply, we must take the two significant sets of digits (6.25 and 3.6) and multiply them together; and we need to take the two powers-of-ten and multiply them together Taking 6.25 times 3.6, we get ... pair of digits in the upper-right hand corner of the display, and are visible only in the "scientific" and "engineering" modes The difference between "scientific" and "engineering" display modes ... multiplication, we can handle the significant digits and powers-of-ten in separate steps (remember that you subtract the exponents of divided powers-of-ten): (2.25 / 6.25) x (1022 / 1018) And the answer...

Ngày tải lên: 09/08/2014, 13:21

... transfer standards Standards are accepted either as industry and de facto standards, or as authoritative national or international standards Industry standards are frequently used standards that were ... required Metadata standards For metadata to be easily read and understood, standards create a common language for users and producers Metadata standards provide appropriate and adequate information ... constituents in x -and ydirection, respectively δx and δy Analogously to the calculation of the variance and standard deviation of a statistical sample, the root mean square errors mx and my of a series...

Ngày tải lên: 21/10/2014, 10:09

... financial, government, and consumer industries 28 It highlighted how to meet domestic and international regulations for corporate-level and government-level standards on security and privacy We believe ... yielding new security issues in current health care systems With appropriate policies and techniques in place, organizations may still have operational handicap in enforcing security [8] First, security ... information technology, and they often lack awareness and training in security enforcement Human factor can constitute the weakest link in the chain of security User awareness promotion and training has...

Ngày tải lên: 12/09/2015, 10:37