chapter 12 network security
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 switches ... vulnerable at switches Particularly on public switched network End to End Encryption Encryption done at ends of system Data in encrypted form crosses network unaltered Destination shares key with source...
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Chapter 31 Network Security docx
... 31-1 SECURITY SERVICES Network security can provide five services Four of these services are related to the message exchanged using the network The fifth service provides ... Integrity Message Authentication Message Nonrepudiation Entity Authentication 31.2 Figure 31.1 Security services related to the message or entity 31.3 31-2 MESSAGE CONFIDENTIALITY The concept ... kept secret 31.10 Figure 31.5 Checking integrity 31.11 Figure 31.6 Criteria of a hash function 31 .12 Example 31.1 Can we use a conventional lossless compression method as a hashing function? Solution...
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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 This ... systems and networks for compliance with the policy Học viện mạng Bach Khoa - Website: www.bkacad.com Developing a Security Policy Học viện mạng Bach Khoa - Website: www.bkacad.com Common Security...
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Chapter 04 network security
... (IFS) Introduction to Network Security Why is Network Security Important? • Computer networks have grown in both size and importance in a very short time If the security of the network is compromised, ... labeling 16 Physical Security Measures 17 Physical Security Measures 18 Common Security Threats: Threats to Networks 19 Common Security Threats: Threats to Networks • • Threats to Networks: four primary ... the types of potential threats to network security are always evolving The Increasing Threat to Security The Increasing Threat to Security • • Over the years, network attack tools and methods...
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Chapter 12 dịch network security
... người dùng cung cấp giao diện đăng nhập tương tác Nó xuất bạn nhấn tổ hợp phím Alt-Ctrl-del Local Security Quản lý sách bảo mật & xác thực người dùng cục Nó chịu trách Authority (LSA) nhiệm phát ... cập trình xác thực & ghi lại kiện kiểm toán cảnh báo sinh hệ thống theo dõi dựa sách kiểm toán Security reference monitor Xác nhận người dùng cho phép có quyền truy cập đối tượng thực thi sách ... người dùng & nhóm tài khoản máy hệ thống cục Windows XP SAM thường dùng hệ thống mạng ngang hàng Security account Manager Active Directory Dịch vụ Active Directory Windows 2000/2003/2008 server...
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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 Authentication 8.4 Integrity ... use private key first, followed by public key Result is the same! 8: Network Security 8-21 Chapter roadmap 8.1 What is network security? 8.2 Principles of cryptography 8.3 Authentication 8.4 Integrity...
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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 compromises the security of ... security service Model for Network Access Security Model for Network Access Security using this model requires us to: select appropriate gatekeeper functions to identify users implement security...
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Cryptography and Network Security Chapter 2 pdf
... years 10.01 hours 128 2128 = 3.4 × 1038 2127 µs = 5.4 × 1024 years 5.4 × 1018 years 168 2168 = 3.7 × 1050 2167 µs = 5.9 × 1036 years 5.9 × 1030 years 26! = × 1026 × 1026 µs = 6.4 × 1 012 years 26 characters ... 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 ... 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...
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Cryptography and Network Security Chapter 6 pptx
... 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 = = Pi XOR DESK1(Ci-1) ... can use keys with E-D-E sequence C = EK1(DK2(EK1(P))) nb encrypt & decrypt equivalent in security if K1=K2 then can work with single DES standardized in ANSI X9.17 & ISO8732 no current ... Chapter – Contemporary Symmetric Ciphers "I am fairly familiar with all the forms of secret writings,...
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Cryptography and Network Security Chapter 7 pptx
... Issues hierarchies of KDC’s required for large networks, but must trust each other session key lifetimes should be limited for greater security use of automatic key distribution on behalf ... significant bit from iterative equation: xi = xi -12 mod n where n=p.q, and primes p,q=3 mod unpredictable, passes next-bit test security rests on difficulty of factoring N is unpredictable ... create a covert channel link encryption obscures header details but overall traffic volumes in networks and at end-points is still visible traffic padding can further obscure flows but at cost...
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Cryptography and Network Security Chapter 8 doc
... Chapter – Introduction to Number Theory The Devil said to Daniel Webster: "Set me a task I can't ... than 200 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 factor ... prime) ø(p) for p.q (p,q prime) ø(pq) = p-1 =(p-1)x(q-1) eg ø(37) = 36 ø(21) = (3–1)x(7–1) = 2x6 = 12 Euler's Theorem a generalisation of Fermat's Theorem aø(n) = (mod n) for any a,n where...
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Cryptography and Network Security Chapter 9 doc
... to one Security of Public Key Schemes like private key schemes brute force exhaustive search attack is always theoretically possible but keys used are too large (>512bits) security ... exponent only takes O(log2 n) multiples for number n eg 75 = 74.71 = 3.7 = 10 mod 11 eg 3129 = 3128 .31 = 5.3 = mod 11 Exponentiation c = 0; f = for i = k downto c = x c f = (f x f) mod n if ... nb exponentiation takes O((log n) 3) operations (easy) uses large integers (eg 1024 bits) security due to cost of factoring large numbers nb factorization takes O(e log n log log n)...
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Cryptography and Network Security Chapter 10 pptx
... scheme (size of n in bits) 112 RSA/DSA (modulus size in bits) 80 160 1024 112 224 2048 128 256 3072 192 384 7680 256 512 15360 512 Summary have considered: distribution of public keys public-key ... similar security ECC offers significant computational advantages Comparable Key Sizes for Equivalent Security Symmetric scheme (key size in bits) 56 ECC-based scheme (size of n in bits) 112 RSA/DSA ... accessed electronically still vulnerable to tampering or forgery Public-Key Authority improve security by tightening control over distribution of keys from directory has properties of directory...
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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 ... encrypt using receivers public-key important that sign first then encrypt message & signature security depends on sender’s private-key Arbitrated Digital Signatures involves use of arbiter ... Chapter 13 – Digital Signatures & Authentication Protocols To guard against the baneful influence...
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Network security Chapter 7 pptx
... well-known in network security world ❒ Bob, Alice (lovers!) want to communicate “securely” ❒ Trudy, the “intruder” may intercept, delete, add messages ❒ 7: Network Security What is network security? ... mod n letter 12 l 7: Network Security 13 Authentication Goal: Bob wants Alice to “prove” her identity to him Protocol ap1.0: Alice says “I am Alice” Failure scenario?? 7: Network Security 14 Authentication: ... algorithm 7: Network Security 12 RSA example: Bob chooses p=5, q=7 Then n=35, z=24 e=5 (so e, z relatively prime) d=29 (so ed-1 exactly divisible by z encrypt: decrypt: letter m me l 12 1524832...
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This chapter covers the following topic: Why Network Security Is Necessary? pdf
... Page 10 Friday, November 16, 2001 10:35 AM 10 Chapter 1: Introduction to Network Security Network Security Policy and the Security Wheel Network security is a continuous process It is necessary ... attack disable the network CiscoSecurePIX.book Page 12 Friday, November 16, 2001 10:35 AM 12 Chapter 1: Introduction to Network Security Step Test the effectiveness of the security safeguards ... four steps of the Security Wheel Figure 1-2 The Security Wheel CiscoSecurePIX.book Page 11 Friday, November 16, 2001 10:35 AM Network Security Policy and the Security Wheel 11 The security policy...
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Chapter 12 – Security Baselines doc
... installation of network services (Web server only installs Web server, not DNS etc) • Read only Domain Controllers • NAP – controls access to networks resources based on computers compliance to security ... to management interfaces • Do Network Mapping, Vulnerability Assessment and Penetration Testing (in a few slides) SNMP Simple Network Management Protocol • Used for network management • Allows ... Fewer default installed features (19 less than 2000 Next slide) • Official Security Guides for securing services • Security Configuration Wizards – easily install and lockdown services • Software...
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NETWORK+ GUIDE TO NETWORKS, FOURTH EDITION - CHAPTER 12 ppt
... indicate the clearest channels Network+ Guide to Networks, 4E 50 Wireless Network Testers (continued) Figure 12- 10: Wireless network testing tool Network+ Guide to Networks, 4E 51 ... certain type of network Network+ Guide to Networks, 4E 33 Tone Generator and Tone Locator (continued) Figure 12- 4: Use of a tone generator and tone locator Network+ Guide to Networks, 4E 34 Multimeter ... used for fiber optic cables Network+ Guide to Networks, 4E 39 Cable Performance Testers (continued) Figure 12- 7: A performance tester Network+ Guide to Networks, 4E 40 Network Monitors • Software...
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Chapter 12 - Security in the IMS docx
... between different security domains Security Domain Security Domain Interdomain traffic SEG SEG Figure 12. 19: Inter-domain traffic through two security gateways 12. 2 NETWORK SECURITY CSCF 309 Zb ... the P-Access -Network- Info header field, allowing the S-CSCF to verify the origin of the request 12. 2 Network Security Network security deals with securing traffic between different security domains, ... for the security associations) and port numbers that it will use CHAPTER 12 SECURITY IN THE IMS 302 Security- Client: ipsec-3gpp; alg=hmac-sha-1-96; ealg=aes-cbc; spi-c=23456789; spi-s =123 45678;...
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