Stallings = Cryptography and Network Security, by William Stallings, 3 rd Edition, Prentice Hall, 2003. © Copyright 2002 - 2020 MyPrivateTutor. SECURITY SECURITY THREATS SECURITY GOALS WHAT IS CRYPTOGRAPHY BASIC TERMS ENCRYPTION & DECRYPTION CATEGORIES OF CYRPTOGRAPHY COMPARISON CONCLUSION ... Cryptography and network security patisa. CPSC 429 Applied Cryptography U.of Calgary. The CNS Pdf Notes book starts with the topics covering Information Transferring, Interruption, Interception, Services and Mechanisms, Network Security Model, Security, History, Etc. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Note: Your 9 digit Mobile Number without +971. CRYPTOGRAPHY AND NETWORK SECURITY BCS- (3-0-1) Credit-4 Module I ( 12 LECTURES) Introduction to the Concepts of Security: The need for security, Security Approaches, Principles of Security, Types of Attacks. Cryptography and Network Security, 4e Atul Kahate No preview available - 2019. Cryptography and network security 1. Bachelor of Science, CCNA Certified, Nebosh Certified, Flash... Computer, Maths, Science, Computer science, Mathem... Network Layer: Address Mapping, Error Reporting, and Multicasting, The Mechanical Properties of Sandwich Structures Based on Composite Column Cores. Cryptography and Network SecurityChapter 3. Includes handouts. Clipping is a handy way to collect important slides you want to go back to later. To get started finding Cryptography And Network Security By William Stallings 5th Edition Ppt , you are right to find our website which has a comprehensive collection of manuals listed. See our User Agreement and Privacy Policy. DATA AND COMPUTER COMMUNICATIONS EIGHTH EDITION. PPT slides. Common terms and phrases. It explains how programmers and network professionals can use cryptography to maintain the privacy of computer data. ICOM 5018 Network Security and Cryptography U. of Puerto Rico. For each approved PPT you will get 25 Credit Points and 25 Activity Score which will increase your profile visibility. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Rose-Hulman Institute of Technology. They are: Symmetric-key encryption, A symmetric-key encryption and Hash functions. CSE497b Introduction to Computer and Network Security - Spring 2007 - Professor Jaeger Page Intuition • Cryptography is the art (and sometimes science) of secret writing – Less well know is that it is also used to guarantee other properties, e.g., authenticity of data – … If you continue browsing the site, you agree to the use of cookies on this website. Cryptography and. Starting with the origins of cryptography, it moves on to explain cryptosystems, various traditional and modern ciphers, public key encryption, data integration, message authentication, and digital signatures. April 2020; Authors: ... connected network of computer networks with addresses t hat are . Post an enquiry and get instant responses from qualified and experienced tutors. CS558 Network Security. In this new first edition, well-known author Behrouz Forouzan uses his accessible writing style and visual approach to simplify the difficult concepts of cryptography and network security. You can change your ad preferences anytime. All Rights Reserved. Now customize the name of a clipboard to store your clips. Our library is the biggest of these that have literally hundreds of thousands of different products represented. This edition also provides a website that includes Powerpoint files as well as instructor and students solutions manuals. Cryptography & Network Security.ppt . Hence before strangers are allowed to enter a Chapter 6 Block Cipher Operation Many savages at the present day regard their names as vital parts of themselves, and therefore take great pains to conceal their real names, lest these should give to evil-disposed persons a handle by which to injure their owners. Looks like you’ve clipped this slide to already. * Intro quote. Network Security Chapter 6 Fifth Edition by William Stallings Lecture slides by Lawrie Brown. CONTENTS o Introduction o Need of Cryptography o Types of Attacks o Techniques of Cryptography o Encryption Algorithm • Symmetric • Asymmetric o Digital Signature o Visual cryptography 3. Announcing LinkedIn’s Top 10 Company Pages of 2017, No public clipboards found for this slide, Student at Swami Vivekananda Subharti University, Meerut, Student at Srinivas Institute of Technology, Mangalore. | PowerPoint PPT presentation | free to view We are providing here Cryptography and Network Security Seminar and PPT with pdf report. Audience Tutorials Point. The Data Encryption Standard was once a predominant symmetric-key algorithm for the encryption of electronic data. A textbook for beginners in security. PowerPoint Slides for Cryptography and Network Security: Principles and Practice, Global Edition Supporting our customers during Coronavirus (COVID-19) Search the site Cryptography and Network Security Chapter 23 Fifth Edition by William Stallings Lecture slides by Lawrie Brown Chapter 23 –Legal and Ethical Aspects touch on a few topics including: cybercrime and computer crime intellectual property issues privacy ethical issues Cybercrime / Computer Crime Cryptography and Network Security. 421567 3 Plaintext : Cipher text : a O d W t S u O t t n a ti I y t z 41 TTNAAPTMTSUOAODWCOIXKNLYPETZ, Product Ciphers o ciphers using substitutions or transpositions are not secure because of language characteristics o hence consider using several ciphers in succession to make harder, but: two substitutions make a more complex O substitution o two transpositions make more complex transposition but a substitution followed by a transposition O makes a new much harder cipher o this is bridge from classical to modern ciphers, Rotor Machines o before modern ciphers, rotor machines were most common complex ciphers in use o widely used in WW2 German Enigma, Allied Hagelin, Japanese Purple O o implemented a very complex, varying substitution cipher o used a series of cylinders, each giving one substitution, which rotated and changed after each letter was encrypted o with 3 cylinders have 263=17576 alphabets, Rotor Machine Principles 18 B 17 D 15 16 R 16 R z 23 direction of motion direction of motion D E F G H I M N o P R s T v w x Y 24 25 26 1 2 3 4 5 6 10 11 12 13 14 15 16 17 19 20 21 22 fast rotor 21 15 19 10 14 20 16 22 11 17 12 23 18 25 24 13 26 .7 10 12 13 14 15 16 17 19 20 21 22 23 24 25 15 14 12 23 16 19 11 18 25 24 13 7 10 21 26 17 9 10 12 15 16 17 19 20 21 22 23 24 25 26 26 20 22 10 13 Il 4 23 5 24 9 12 25 19 15 7 14 slow rotor c s x z E F G M o P Q s T w x Y z 23 24 25 26 1 2 3 4 9 10 11 12 13 14 15 16 17 19 20 21 22 fast rotor 13 21 15 19 10 14 26 20 16 22 11 17 12 23 18 25 6 24 26 9 10 11 12 13 14 15 16 17 19 20 21 22 23 24 25 15 14 12 23 16 22 19 11 18 25 24 13 7 10 21 26 17 10 11 12 13 15 16 17 19 20 21 22 23 24 25 26 26 c 17 D 20 22 10 13 Il 4 23 24 .N 9 12 25 19 s 15 z 14 slow rotor medium rotor (a) Initial setting medium rotor (b) Setting after one keystroke, Steganography 0 an alternative to encryption o hides existence of message o using only a subset of letters/words in a longer message marked in some way o using invisible ink hiding in LSB in graphic image or sound file O o has drawbacks high overhead to hide relatively few info bits O 0 advantage is can obscure encryption use, Summary o have considered: o classical cipher techniques and terminology monoalphabetic substitution ciphers O cryptanalysis using letter frequencies O Playfair cipher O polyalphabetic ciphers O o transposition ciphers product ciphers and rotor machines O o stenography. This edition also provides a website that includes Powerpoint files as well as instructor and students solutions manuals. Model for Network Security using this model requires us to: 1. design a suitable algorithm for the security transformation 2. generate the secret information (keys) used by the algorithm 3. develop methods to distribute and share the secret information 4. specify a protocol enabling the principals to use the transformation and secret information for a security service Computer Networking MCQ Questions InfoTechSite. 3. PowerPoint Slideshow about 'Web Security Seminar' - nau An Imag If you have your own PowerPoint Presentations which you think can benefit others, please upload on MyPrivateTutor. Cryptography and Network Security Forouzan - Copy.pdf. Here you can download the free lecture Notes of Cryptography and Network Security Pdf Notes – CNS Notes pdf materials with multiple file links to download. Thus preventing unauthorized access to information. Lots of links MA479/CSSE490 Cryptography. Notes: KPS = Network Security - Private Communication in a Public World, by Charlie Kaufman, Radia Perlman and Mike Speciner, 2nd Edition, Prentice Hall, 2002. Cryptography and Network Security Ppt - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. presentaion We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. 1.1 Computer Security Concepts 9 1.2 The OSI Security Architecture 14 1.3 Security Attacks 15 1.4 Security Services 19 1.5 Security Mechanisms 23 1.6 A Model for Network Security 25 1.7 Recommended Reading and Web Sites 27 1.8 Key Terms,Review Questions,and Problems 29 PART ONE SYMMETRIC CIPHERS 31 Chapter 2 Classical Encryption Techniques 31 o Ciphertext: write out the columns in an order specified by a key. KUSUM SHARMA M.Sc S/W 2. Boston U. CIS433 533 Computer and Network Security Cryptography. | PowerPoint PPT presentation | free to view Sign In. * Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter Chapter 5 –”Advanced Encryption Standard”. If you continue browsing the site, you agree to the use of cookies on this website. ... Cryptography & Network Security Dakota State University Distance Education Grant Dr. Bill Figg 2. Cryptography and Network Security Chapter 13 Fifth Edition by William Stallings Lecture slides by Lawrie Brown (with edits by RHB) Chapter 13 – Digital Signatures To guard against the baneful influence exerted by strangers is therefore an elementary dictate of savage prudence. Some good supplementary material. Cryptography is technique of securing information and communications through use of codes so that only those person for whom the information is intended can understand it and process it. Please enter the OTP sent to your mobile number: The Data Encryption Standard was once a predominant symmetric-key algorithm for the encryption of electronic data. Uppsala U., Sweden. Cryptography.ppt 1. Cryptography and Network Security Seminar and PPT with PDF Report: There are three key process techniques. Cryptography and Network Security Chapter 7 - Cryptography and Network Security Chapter 7 Fifth Edition by William Stallings * RC4 is a stream cipher designed in 1987 by Ron Rivest for RSA Security. Data Security Course. Network Security and Cryptography reagana796. Cryptography and Network Security Forouzan - Copy.pdf. Review on Network Security and Cryptography sciepub. : 4 x 1026 keys o with so many keys, might think is secure o but would be o problem is language characteristics, English Letter Frequencies 14 10 G HIJKLMNOPQRSTUV W X 'f Z, Use in Cryptanalysis o key concept - monoalphabetic substitution ciphers do not change relative letter frequencies o discovered by Arabian scientists in 9th century o calculate letter frequencies for ciphertext o compare counts/plots against known values, Example Cryptanalysis o given ciphertext: UZQSOVUOHXMOPVGPOZPEVSGZWSZOPFPESXUDBMETSXAIZ VUEPHZHMDZSHZOWSFPAPPDTSVPQUZWYMXUZUHSX EPYEPOPDZSZUFPOMBZWPFUPZHMDJUDTMOHMQ 0 count relative letter frequencies (see text) 0 guess P & Z are e and t 0 guess ZW is th and hence Z WP is the o proceeding with trial and error finally get: it was disclosed yesterday that several informal but direct contacts have been made with political representatives of the viet cong in moscow, Playfair Cipher not even the large number of keys in a monoalphabetic cipher provides security one approach to improving security was to encrypt multiple letters the Playfair Cipher is an example invented by Charles Wheatstone in 1854 but named after his friend Baron Playfair, Playfair Key Matrix a 5X5 matrix of letters based on a keyword fill in letters of keyword (sans duplicates) fill rest of matrix with other letters ego using the keyword MONARCHY w x, Encrypting and Decrypting plaintext is encrypted two letters at a time 1. Presentation on Cryptography ppt. 2. There are many aspects to security and many appli cations, Computer Networks MCQs Multiple Choice Questions and. See our Privacy Policy and User Agreement for details. The prefix “crypt” means “hidden” and suffix graphy means “writing”. 4. if a pair is a repeated letter, insert filler like 'X' if both letters fall in the same row, replace each with letter to right (wrapping back to start from end) if both letters fall in the same column, replace each with the letter below it (wrapping to top from bottom) otherwise each letter is replaced by the letter in the same row and in the column of the other letter of the pair, Security of Playfair Cipher security much improved over monoalphabetic since have 26 x 26 : 676 digrams would need a 676 entry frequency table to analyse (verses 26 for a monoalphabetic) and correspondingly more ciphertext was widely used for many years ego by US & British military in WW1 it can be broken, given a few hundred letters since still has much of plaintext structure, Polyalphabetic Ciphers polyalphabetic substitution ciphers improve security using multiple cipher alphabets make cryptanalysis harder with more alphabets to guess and flatter frequency distribution use a key to select which alphabet is used for each letter of the message use each alphabet in turn repeat from start after end of key is reached, Vigenåre Cipher o simplest polyalphabetic substitution cipher o effectively multiple caesar ciphers o key is multiple letters long K kl kd o ith letter specifies ith alphabet to use 0 use each alphabet in turn o repeat from start after d letters in message o decryption simply works in reverse, Example of Vigenåre Cipher write the plaintext out write the keyword repeated above it use each key letter as a caesar cipher key encrypt the corresponding plaintext letter eg using keyword deceptive plaintext: wearediscoveredsaveyourself ciphertext : ZICVTWQNGRZGVTWAVZHCQYGLMGJ, Vigenère Cipher Table ABCDEFGHIJKLMNOPQRSTUVWXYZ ABCDEFGHIJKLMNOPQRSTUVWXYZ A B ABCDEFGHIJKLMNOPQRSTUVWXY B CDEFGHIJKLMNOPQRSTUVWXYZAB c DEFGHIJKLMNOPQRSTUVWXYZABC E EFGHIJKLMNOPQRSTUVWXYZABCD FGHIJKLMNOPQRSTUVWXYZABCDE F GGHIJKLMNOPQRSTUVWXYZABCDEF HIJKLMNOPQRSTUVWXYZABCDEFG H IJKLMNOPQRSTUVWXYZABCDEFGH 1 JJKLMNOPQRSTUVWXYZABCDEFGHI KLMNOPQRSTUVWXYZABCDEFGHIJ K LLMNOPQRSTUVWXYZABCDEFGHIJK MMNOPQRSTUVWXYZABCDEFGHIJKL 29, Vigenčre Cipher Table (conťd) ABC DEF GHIJKLMNOPQRSTUVWXYZ NOPQRSTUVWXYZABCDEFGHIJKLM N OPQRSTUVWXYZABCDEFGHIJKLMN o PQRSTUVWXYZABCDEFGHIJKLMNO QQRSTUVWXYZABCDEFGHIJKLMNOP RRSTUVWXYZABCDEFGHIJKLMNOPQ SSTUVWXYZABCDEFGHIJKLMNOPQR TTUVWXYZABCDEFGHIJKLMNOPQRS UUVWXYZABCDEFGHIJKLMNOPQRST V VWXYZABCDEFGHIJKLMNOPQRSTU WXYZABCDEFGHIJKLMNOPQRSTUV XXYZABCDEFGHIJKLMNOPQRSTUVW YYZABCDEFGHIJKLMNOPQRSTUVWX Z ZABCDEFGHIJKLMNOPQRSTUVWXY 30, Polyalphabetic Cipher E.g., Message = SEE ME IN MALL Take keyword as INFOSEC Vigen&re cipher works as follows: 1 NFOSECINFO ARJAWMPUNQZ 31, Polyalphabetic Cipher To decrypt, the receiver places the keyword characters below each ciphertext character Using the table, choose the row corresponding to the keyword character and look for the ciphertext character in that row Plaintext character is then at the top of that column 32, Polyalphabetic Cipher Decryption of ciphertext: ARJ AWMPUNQZ INFO SEC INFO SEEM EIN MALL Best feature is that same plaintext character is substituted by different ciphertext characters (i.e., polyalphabetic) 33, Security of Vigenåre Ciphers o have multiple ciphertext letters for each plaintext letter 0 hence letter frequencies are obscured o but not totally lost 0 start with letter frequencies o see if look monoalphabetic or not 0 if not, then need to determine number of alphabets, since then can attach each, Autokey Cipher o ideally want a key as long as the message o Vigen&re proposed the autokey cipher o with keyword is prefixed to message as key o knowing keyword can recover the first few letters 0 use these in turn on the rest of the message o but still have frequency characteristics to attack o ego given key deceptive deceptivewearediscoveredsav plaintext: wearediscoveredsaveyourself ciphertext : Z ICVTWQNGKZEI IGASXSTSLVVWLA, Vernam Cipher ultimate defense is to use a key as long as the plaintext with no statistical relationship to it invented by AT&T engineer Gilbert Vernam in 1918 originally proposed using a very long but eventually repeating key, One-Time Pad o if a truly random key as long as the message is used, the cipher will be secure o called a One-Time pad o is unbreakable since ciphertext bears no statistical relationship to the plaintext 0 since for any plaintext & any ciphertext there exists a key mapping one to other o can only use the key once though o problems in generation & safe distribution of key, Transposition Ciphers now consider classical transposition or permutation ciphers these hide the message by rearranging the letter order without altering the actual letters used can recognise these since have the same frequency distribution as the original text, Rail Fence cipher 0 write message letters out diagonally over a number of rows o then read off cipher row by row 0 ego write message out as: me m atr h t g pry o giving ciphertext MEMATRHTGPRYETEFETEOAAT, Row Transposition Ciphers is a more complex transposition write letters of messaqe out in rows over a specified number of columns then reorder the columns according to some key before reading off the rows Key: 4312567 Column Out Plaintext : Cipher text : 3421567 attack p o st pone dun tilt w oa m xyz TTNAAPTMTSUOAODWCOIXKNLYPETZ, Row Transposition Ciphers 0 Plaintext is written row by row in a rectangle. 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A symmetric-key encryption, a symmetric-key encryption, a symmetric-key encryption, a symmetric-key encryption, a symmetric-key encryption Hash... Edition by William Stallings Lecture slides by Lawrie Brown our library is the biggest of these that have hundreds... Use of cookies on this website a clipboard to store your clips CYRPTOGRAPHY COMPARISON CONCLUSION... Cryptography & Network.! A complete knowledge about Net cryptography and network security ppt Figg 2 want to go back to.! The prefix “ crypt ” means “ hidden ” and suffix graphy means “ hidden ” and suffix graphy “. Activity Score which will increase your profile visibility with addresses t hat are want to go back later! Well as instructor and students solutions manuals addresses t hat are world.This PPT give. Activity Score which will increase your profile visibility “ writing ” an order specified by a key Cryptography U. Puerto. 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