SECURITY SECURITY THREATS SECURITY GOALS WHAT IS CRYPTOGRAPHY BASIC TERMS ENCRYPTION & DECRYPTION CATEGORIES OF CYRPTOGRAPHY COMPARISON CONCLUSION ... Cryptography and network security patisa. Some good supplementary material. 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 PRATIKSHA PATIL 2. It was highly influential in the advancement of modern cryptography in the academic world.This PPT will give a complete knowledge about Net Security. Common terms and phrases. ... Cryptography & Network Security Dakota State University Distance Education Grant Dr. Bill Figg 2. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. For each approved PPT you will get 25 Credit Points and 25 Activity Score which will increase your profile visibility. Network Security and Cryptography reagana796. PowerPoint Slideshow about 'Web Security Seminar' - nau An Imag by William Stallings Lecture slides by Lawrie Brown. Cryptography and Network Security. Cryptography and Network Security Seminar and PPT with PDF Report: There are three key process techniques. Slideshare uses cookies to improve functionality and performance, and to provide you with relevant advertising. Boston U. Review on Network Security and Cryptography sciepub. See our User Agreement and Privacy Policy. 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 – … 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. * Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter Chapter 5 –”Advanced Encryption Standard”. April 2020; Authors: ... connected network of computer networks with addresses t hat are . There are many aspects to security and many appli cations, 3. The prefix “crypt” means “hidden” and suffix graphy means “writing”. Data Security Course. 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) Cryptography and Network Security, 4e Atul Kahate No preview available - 2019. Clipping is a handy way to collect important slides you want to go back to later. | PowerPoint PPT presentation | free to view Lots of links MA479/CSSE490 Cryptography. We are providing here Cryptography and Network Security Seminar and PPT with pdf report. Network Security Chapter 6 Fifth Edition by William Stallings Lecture slides by Lawrie Brown. Our library is the biggest of these that have literally hundreds of thousands of different products represented. : 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. PowerPoint Slides for Cryptography and Network Security: Principles and Practice, Global Edition Supporting our customers during Coronavirus (COVID-19) Search the site 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 Rose-Hulman Institute of Technology. CPSC 429 Applied Cryptography U.of Calgary. See our Privacy Policy and User Agreement for details. Uppsala U., Sweden. All Rights Reserved. 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. They are: Symmetric-key encryption, A symmetric-key encryption and Hash functions. 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. 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. 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. 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 types of network Zenobia … Presentation on Cryptography ppt. Cryptography.ppt 1. Stallings = Cryptography and Network Security, by William Stallings, 3 rd Edition, Prentice Hall, 2003. Cryptography and Network SecurityChapter 3. 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. Lecture slides by Lawrie Brown for “Cryptography and Network Security”, 5/e, by William Stallings, Chapter 3 – “Block Ciphers and the Data Encryption Standard”. Fifth Edition. CS558 Network Security. 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. 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. It was highly influential in the advancement of modern cryptography in the academic world.This PPT will give a complete knowledge about Net Security. 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. CIS433 533 Computer and Network Security Cryptography. You more relevant ads approved PPT you will get 25 Credit Points and 25 activity Score will... & DECRYPTION CATEGORIES of CYRPTOGRAPHY COMPARISON CONCLUSION... Cryptography and Network Security 4e. With relevant advertising literally hundreds of thousands of different products represented advancement of modern in. Graphy means “ writing ” Edition by William Stallings Lecture slides by Lawrie Brown preview. 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