Chapter 12 dịch network security
CCNAS v1 2 Chapter 01 Modern network security threats + lab (pdf)
... 20 01 January 20 03 August 20 03 August 20 03 November 20 03 January 20 04 April 20 04 August 20 05 January 20 06 January 20 07 20 07 June 20 08 July 20 09 June 20 11 September 20 12 Examples of other worms ... network security professionals manage the constantly evolving threats to networks Page | 1 .2. 1.3 Page 1.1.1.3 Evolution of Network Security Tools The evol...
Network Security Chapter goals pptx
... Access control: firewalls 8.7 Attacks and counter measures 8.8 Security in many layers 8: Network Security 8-2 What is network security? Confidentiality: only sender, intended receiver should ... others (e.g., by overloading resources) ❍ more on this later …… 8: Network Security 8-6 Chapter roadmap 8.1 What is network security? 8.2 Principles of cryptography 8.3 Authenticati...
Chapter 18: Network Security pot
... deterrent Hard to prevent Security Threats Conventional Encryption Ingredients Plain text Encryption algorithm Secret key Cipher text Decryption algorithm Requirements for Security Strong encryption ... All traffic secure High level of security Requires lots of encryption devices Message must be decrypted at each switch to read address (virtual circuit number) Security vulnerable at s...
Cryptography and Network Security Chapter 1 doc
... pervasive security mechanisms: trusted functionality, security labels, event detection, security audit trails, security recovery Model for Network Security Model for Network Security using ... Aspects of Security consider aspects of information security: security attack security mechanism security service Security Attack any action that compr...
Cryptography and Network Security Chapter 2 pdf
... decryptions/µs 32 2 32 = 4.3 × 109 23 1 µs = 35.8 minutes 2. 15 milliseconds 56 25 6 = 7 .2 × 1016 25 5 µs = 11 42 years 10.01 hours 128 21 28 = 3.4 × 1038 21 27 µs = 5.4 × 1 024 years 5.4 × 1018 years 168 21 68 = ... y z 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 then c p = = have Caesar cipher as: E(p) D(c) = = (p (c + – k) k) mod mod (26 ) (26 ) Cryptanalysis of Ca...
Cryptography and Network Security Chapter 6 pptx
... stage (hence name) standard allows any number of bit (1,8, 64 or 128 etc) to be feed back denoted CFB-1, CFB-8, CFB -64 , CFB-128 etc most efficient to use all bits in block (64 or 128) Ci C-1 ... for each message byte Mi i = (i + 1) (mod 2 56) j = (j + S[i]) (mod 2 56) swap(S[i], S[j]) t = (S[i] + S[j]) (mod 2 56) Ci = Mi XOR S[t] RC4 Overview RC4 Security claimed secure against kno...
Cryptography and Network Security Chapter 7 pptx
... algorithmic techniques to create “random numbers” although are not truly random can pass many tests of “randomness” known as “pseudorandom numbers” created by “Pseudorandom Number Generators (PRNGs)” ... for cipher use, good for key generation Natural Random Noise best source is natural randomness in real world find a regular but random event and monitor generally need special h/w...
Cryptography and Network Security Chapter 8 doc
... 1,2,4 ,8 and of 15 are 1,3,5,15 and is the only common factor conversely can determine the greatest common divisor by comparing their prime factorizations and using least powers eg 300=21x31x52 18= 21x32 ... is: 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71 73 79 83 89 97 101 103 107 109 113 127 131 137 139 149 151 157 163 167 173 179 181 191 193 197 199 Prime Factorisation to...
Cryptography and Network Security Chapter 9 doc
... Chapter – Public Key Cryptography and RSA Every Egyptian received two names, which were known respectively as the true name and the good name, or the great name and the little name; and while the good ... Bough, Sir James George Frazer Private-Key Cryptography traditional private/secret/single key cryptography uses one key shared by both sender and receiver if this k...
Chapter 31 Network Security docx
... Announcing a public key 31. 45 Figure 31. 24 Trusted center 31. 46 Figure 31. 25 Controlled trusted center 31. 47 Figure 31. 26 Certification authority 31. 48 Figure 31. 27 PKI hierarchy 31. 49 ... Distribution 31. 38 Figure 31. 19 KDC 31. 39 Note A session symmetric key between two parties is used only once 31. 40 Figure 31. 30 Creating a session key between Alice and Bob using...
Cryptography and Network Security Chapter 10 pptx
... Chapter 10 – Key Management; Other Public Key Cryptosystems No Singhalese, whether man or woman, would venture out of the house without a bunch of keys in his hand, for without ... key and their identity B generates a session key K sends it to A encrypted using the supplied public key A decrypts the session key and both use problem is that an opponent can intercept and ... users cou...
Cryptography and Network Security Chapter 13 pot
... Algorithm (DSA) creates a 320 bit signature with 512-1024 bit security smaller and faster than RSA a digital signature scheme only security depends on difficulty of computing discrete logarithms ... Creation to sign a message M the sender: generates a random signature key k, k
Chapter 4 – Network Security docx
... versus Closed Networks Học viện mạng Bach Khoa - Website: www.bkacad.com Open Access Network • • • An open security model is the easiest to implement Simple passwords and server security become ... mạng Bach Khoa - Website: www.bkacad.com Closed Access Networks • • • A closed security model is most difficult to implement All available security measures are implemented in this design...
Network security Chapter 7 pptx
... encrypt: decrypt: letter m me l 12 1524832 c 17 d c 481968 572 10 675 0915091411825223 072 000 c = me mod n 17 m = cd mod n letter 12 l 7: Network Security 13 Authentication Goal: Bob wants Alice to “prove” ... Figure 7. 1 goes here well-known in network security world ❒ Bob, Alice (lovers!) want to communicate “securely” ❒ Trudy, the “intruder” may intercept, delete, add messages...
This chapter covers the following topic: Why Network Security Is Necessary? pdf
... of the time security was an afterthought Why Network Security Is Necessary Today, the Internet is made up of tens of thousands of networks, interconnected without boundary Network security is ... stop the source(s) CiscoSecurePIX.book Page 10 Friday, November 16, 2001 10:35 AM 10 Chapter 1: Introduction to Network Security Network Security Policy and the...