presentations for free. No public clipboards found for this slide, Student at Swami Vivekananda Subharti University, Meerut, Student at Srinivas Institute of Technology, Mangalore. So, it is also called as a science of defending or protecting data and the cryptanalyst is called as attackers, the cryptology includes both the cryptography and cryptanalyst. We use your LinkedIn profile and activity data to personalize ads and to show you more relevant ads. Or use it to find and download high-quality how-to PowerPoint ppt presentations with illustrated or animated slides that will teach you how to do something new, also for free., - Title: Network Security Author: Adeel Akram Last modified by: Waleed Ejaz Created Date: 10/23/2005 2:43:42 PM Document presentation format: On-screen Show, - Cryptography and Network Security Contemporary Symmetric Ciphers, - Cryptography and Network Security 4/e -, Message Authentication and Hash Functions, non-repudiation of origin (dispute resolution), message encryption (protecting message content ), message encryption by itself also provides a, receiver know sender must have created it, since only sender and receiver now key used, if message has suitable structure, redundancy or, encryption provides no confidence of sender, since anyone potentially knows public-key, sender signs message using their private-key, again need to recognize corrupted messages, but at cost of two public-key uses on message, A hash function is a one-way function that allows, This hash will allow us to make sure that the, The receiver can take the message, calculate the, This provides Integrity services the message, It does not provide authentication anybody can, So, if in addition of integrity services, we want, Goal we want the sender to create an hash based, These services will be provided by a Message, Conventional Encryption. Cryptography and Network Security Chapter 7. M.N.M Jain Engineering College, Chennai.

Cryptography and Network Security Ppt. After you enable Flash, refresh this page and the presentation should play. Looks like you’ve clipped this slide to already. Our new CrystalGraphics Chart and Diagram Slides for PowerPoint is a collection of over 1000 impressively designed data-driven chart and editable diagram s guaranteed to impress any audience. It was highly influential in the advancement of modern cryptography in the academic world.This PPT will give a complete knowledge about Net Security. public-key crypto: encryption key . Cryptography and network security patisa. They'll give your presentations a professional, memorable appearance - the kind of sophisticated look that today's audiences expect. Learn more. - Cryptography and Network Security Chapter 5 Fifth Edition by William Stallings Lecture s by Lawrie Brown, Cryptography and Network Security Chapter 16, - Cryptography and Network Security Chapter 16 Fifth Edition by William Stallings Lecture s by Lawrie Brown. Learn more. - CSE 651: Introduction to Network Security Steve Lai Spring 2010 * * Syllabus Instructor: Steve Lai Office: DL 581 Office hours: MWF 2:30-3:30 Email: lai@cse.ohio ... - Cryptography and Network Security Third Edition by William Stallings. PPT – Cryptography and Network Security PowerPoint presentation | free to view - id: 3c647e-NzRkN, The Adobe Flash plugin is needed to view this content.

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Contents, Cryptography and Network Security Chapter 1, - Title: William Stallings, Cryptography and Network Security 5/e Subject: Lecture Overheads - Ch 1 Author: Dr Lawrie Brown Last modified by: cychen, - Title: William Stallings, Cryptography and Network Security 5/e Subject: Lecture Overheads - Ch 18 Author: Dr Lawrie Brown Last modified by: Cetin Kaya Koc. 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. - EE5552 Network Security and Encryption block 6 Dr. T.J. Owens CMath, FIMA, MIEEE Dr T. Itagaki MIET, MIEEE, MAES Weak Keys In DES there are four keys for which ... Cryptography and Network Security Chapter 8, - Title: Cryptography and Network Security 4/e Subject: Lecture Overheads Author: Dr Lawrie Brown Last modified by: Lawrie Brown Created Date: 3/28/2002 2:06:54 AM, CSE 651: Introduction to Network Security. Same idea but the sender, Shared Secret Value. 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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