DATA AND COMPUTER COMMUNICATIONS EIGHTH EDITION. Download Free and Get a Copy in your Email. See our Privacy Policy and User Agreement for details. It was highly influential in the advancement of modern cryptography in the academic world.This PPT will give a complete knowledge about Net Security. 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 CRYPTOGRAPHY AND NETWORK SECURITY, SIXTH EDITION New topics for this edition include SHA-3, key wrapping, elliptic curve digital signature algorithm (ECDSA), RSA probabilistic signature scheme (RSA-PSS), Intel’s Digital Random Number Generator, cloud security, network access control, personal identity verification (PIV), and mobile device security. See our User Agreement and Privacy Policy. Some good supplementary material. presentaion 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. Cryptographic Tools o cryptographic algorithms important element in security services o review various types of elements symmetric encryption O public-key (asymmetric) encryption O digital signatures and key management O o secure hash functions o example is use to encrypt stored data, Symmetric Encryption o or conventional / private-key / single-key 0 sender and recipient share a common key o all classical encryption algorithms are private-key o was only type prior to invention of public- key in 1970's o and by far most widely used, Some Basic Terminology o plaintext - original message o ciphertext - coded message o cipher - algorithm for transforming plaintext to ciphertext o key - info used in cipher known only to sender/receiver, Some Basic Terminology o encipher (encrypt) - converting plaintext to ciphertext o decipher (decrypt) - recovering ciphertext from plaintext 0 cryptography - study of encryption principles/methods 0 cryptanalysis (codebreaking) - study of principles/ methods of deciphering ciphertext without knowing key o cryptology - field of both cryptography and cryptanalysis, Symmetric Cipher Model Secret key shared by sender and recipient x Plaintext Encryption algorithm input (e.g., AES) Transmitted ciphertext Secret key shared by sender and recipient Plaintext Decryption algorithm output (reverse of encryption algorithm), Requirements o two requirements for secure use of symmetric encryption: o a strong encryption algorithm a secret key known only to sender / receiver O 0 mathematically have: o assume encryption algorithm is known o implies a secure channel to distribute key, Cryptography o can characterize cryptographic system by: type of encryption operations used O substitution transposition product number of keys used O single-key or private two-key or public way in which plaintext is processed O block stream, Cryptanalysis o objective to recover key not just message o general approaches: cryptanalytic attack O brute-force attack O o if either succeed all key use compromised, Attacking Symmetric Encryption o cryptanalysis o rely on nature of the algorithm plus some knowledge of plaintext characteristics O even some sample plaintext-ciphertext pairs O exploits characteristics of algorithm to deduce O specific plaintext or key o brute-force attack try all possible keys on some ciphertext until get O an intelligible translation into plaintext, Cryptanalytic Attacks ciphertext only o only know algorithm & ciphertext, is statistical, know or can identify plaintext known plaintext o know/suspect plaintext & ciphertext chosen plaintext o select plaintext and obtain ciphertext chosen ciphertext o select ciphertext and obtain plaintext chosen text select plaintext or ciphertext to en/decrypt, Brute Force Search o always possible to simply try every key 0 most basic attack, proportional to key size 0 assume either know / recognise plaintext Key Size (bits) 32 56 128 168 26 characters (permutation) Number of Alternative Time required at 1 decryption/ps 232 256 2128 2168 Keys 4.3 x 109 7.2 x 1016 3.4 x 1038 3.7 x 1050 4 x 1026 231 us 255 us 2127 us 2167 s 2 x 1026 us 35.8 minutes 1142 years 5.4 x 1024 years 5.9 x 1036 years 6.4 x 1012 years Time required at 106 decryptions/ps 2.15 milliseconds 10.01 hours 5.4 x 1018 years 5.9 x 1030 years 6.4 x 106 years, Classical Substitution Ciphers o where letters of plaintext are replaced by other letters or by numbers or symbols o or if plaintext is viewed as a sequence of bits, then substitution involves replacing plaintext bit patterns with ciphertext bit patterns, Caesar Cipher 0 earliest known substitution cipher o by Julius Caesar 0 first attested use in military affairs o replaces each letter by 3rd letter on 0 example: meet me after the toga party PHHW PH DIWHU WKH WRJD SDUWB, Caesar Cipher 0 can define transformation as: abcdefghijk 1m nopqrstuvwxyz DEFGHIJKLMNOPQRSTUVWXYZABC 0 mathematically give each letter a number abcdef g h i j k 1 111 012345678 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 o then have Caesar cipher as: c: E(k, p) : (p + k) mod (26) p: D(k, c) : (c - k) mod (26), Cryptanalysis of Caesar Cipher only have 26 possible ciphers A maps to could simply try each in turn a brute force search given ciphertext, just try all shifts of letters, Monoalphabetic Cipher 0 rather than just shifting the alphabet 0 could shuffle (jumble) the letters arbitrarily 0 each plaintext letter maps to a different random ciphertext letter o hence key is 26 letters long Plain: abcde fghij klmnopqrstuvwxyz Cipher: DKVQFIBJWPESCXHTMYAUOLRGZN Plaintext : ifwewishtoreplaceletters Ciphertext: WIRFRWAJUHYFTSDVFSFUUFYA, Monoalphabetic Cipher Security o now have a total of 26! Audience Tutorials Point. * Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter Chapter 5 –”Advanced Encryption Standard”. ... Cryptography & Network Security Dakota State University Distance Education Grant Dr. Bill Figg 2. Cryptography.ppt 1. Clipping is a handy way to collect important slides you want to go back to later. © Copyright 2002 - 2020 MyPrivateTutor. Cryptography and Network Security Ppt - Free download as Powerpoint Presentation (.ppt / .pptx), PDF File (.pdf), Text File (.txt) or view presentation slides online. Boston U. Note: Your 9 digit Mobile Number without +971. by William Stallings Lecture slides by Lawrie Brown. 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. It explains how programmers and network professionals can use cryptography to maintain the privacy of computer data. 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 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. All Rights Reserved. Looks like you’ve clipped this slide to already. Computer Networks MCQs Multiple Choice Questions and. If you continue browsing the site, you agree to the use of cookies on this website. 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. Fifth Edition. CIS433 533 Computer and Network Security Cryptography. : 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. The CNS Pdf Notes book starts with the topics covering Information Transferring, Interruption, Interception, Services and Mechanisms, Network Security Model, Security, History, Etc. Cryptography and Network Security, 4e Atul Kahate No preview available - 2019. Computer Networking MCQ Questions InfoTechSite. Lots of links MA479/CSSE490 Cryptography. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. PowerPoint Lecture Slides for Cryptography and Network Security: Principles and Practice, 6th Edition Download Lecture PowerPoints 1-5 (application/zip) (17.9MB) Download Lecture PowerPoints 6-10 (application/zip) (10.5MB) For each approved PPT you will get 25 Credit Points and 25 Activity Score which will increase your profile visibility. CRYPTOGRAPHY PRATIKSHA PATIL 2. The Data Encryption Standard was once a predominant symmetric-key algorithm for the encryption of electronic data. April 2020; Authors: ... connected network of computer networks with addresses t hat are . Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter 3 – “Block Ciphers and the Data Encryption Standard”. Sign In. types of network Zenobia … 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. If you have your own PowerPoint Presentations which you think can benefit others, please upload on MyPrivateTutor. 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. 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 * Intro quote. Stallings = Cryptography and Network Security, by William Stallings, 3 rd Edition, Prentice Hall, 2003. Post an enquiry and get instant responses from qualified and experienced tutors. Hence before strangers are allowed to enter a PowerPoint Slides for Cryptography and Network Security: Principles and Practice, Global Edition Supporting our customers during Coronavirus (COVID-19) Search the site It was highly influential in the advancement of modern cryptography in the academic world.This PPT will give a complete knowledge about Net Security. Now customize the name of a clipboard to store your clips. 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 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. 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. | PowerPoint PPT presentation | free to view Includes handouts. Security In Adhoc Network Paper Presentation & Seminar Ad hoc networks do not have a fixed network topology. 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. o Ciphertext: write out the columns in an order specified by a key. Thus preventing unauthorized access to information. 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. Our library is the biggest of these that have literally hundreds of thousands of different products represented. 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. Common terms and phrases. Uppsala U., Sweden. PowerPoint Slideshow about 'Web Security Seminar' - nau An Imag Presentation on Cryptography ppt. KUSUM SHARMA M.Sc S/W 2. A textbook for beginners in security. Cryptography and Network Security. Cryptography and. ICOM 5018 Network Security and Cryptography U. of Puerto Rico. Cryptography and Network Security Forouzan - Copy.pdf. 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 – … PPT slides. We are providing here Cryptography and Network Security Seminar and PPT with pdf report. The prefix “crypt” means “hidden” and suffix graphy means “writing”. 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. If you continue browsing the site, you agree to the use of cookies on this website. 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. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Data Security Course. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Network Security Chapter 6 Fifth Edition by William Stallings Lecture slides by Lawrie Brown. 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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