trusted computer security evaluation criteria

... confidence in satisfaction of security needs Evaluation Criteria n Trusted Computer Security Evaluation Criteria – (TCSEC) was developed in 1985 by National Computer Security Center (NCSC) TCSEC ... Orange Book n Orange Book – Trusted Computer Security Evaluation Criteria TNI Evaluation Classes D – Minimal protection C – Discretionary protection C1 – Discretionary Security Protection C2 – Controlled ... Non-repudiation n Logging and monitoring OSI Security - Security Mechanisms A security mechanism is a control that is implemented in order to provide the basic security services n Encipherment n Digital...

Ngày tải lên: 18/10/2015, 23:17

... equal CHAPTER OVERVIEW 1.1 Computer Security Concepts A Definition of Computer Security Examples The Challenges of Computer Security 1.2 The OSI Security Architecture 1.3 Security Attacks Passive ... types of network security violations, it illustrates the range of concerns of network security 1.1 COMPUTER SECURITY CONCEPTS A Definition of Computer Security The NIST Computer Security Handbook ... Overview 1.1 Computer Security Concepts 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...

Ngày tải lên: 07/12/2013, 11:53

... elements of an IT security architecture that each campus should consider when developing its security plan These common elements include network security, computer (or “host”) security, middleware ... traffic to all computers connected to that hub The security implication is that if one computer has its security compromised it can be used to monitor network traffic coming from any other computer ... systems Because 77 78 COMPUTER AND NETWORK SECURITY IN HIGHER EDUCATION they are often targets, securing the computers—that is, host-based security is an important part of our IT security architecture...

Ngày tải lên: 14/02/2014, 16:20

... Section 1.1 Security Trends Section 1.2 The OSI Security Architecture Section 1.3 Security Attacks Section 1.4 Security Services Section 1.5 Security Mechanisms Section 1.6 A Model for Network Security ... user authentication, e-mail, IP security, and Web security Part Four: System Security: Deals with security facilities designed to protect a computer system from security threats, including intruders, ... cryptographic-strength random number generators alt .security: A general discussion of security topics comp .security. misc: A general discussion of computer security topics comp .security. firewalls: A discussion of...

Ngày tải lên: 18/02/2014, 08:20

Ngày tải lên: 24/02/2014, 04:20

... information security support and Yale’s IT web sites have comprehensive information on security Yale has assigned IT Security Officials who are responsible for oversight of the IT security policies ... possible IT security incidents If you have any questions about general IT security information, you should contact one of the Information Security Office staff Links: ITS Report IT security incidents ... asset is damaged Recognize when your computer may be compromised Information security compromise of a system often results in a dramatic change in your own computer s performance that can be observed...

Ngày tải lên: 05/03/2014, 23:20

... practices in computer security and data confidentiality Security experts advise that computer security is an ongoing process, not a single safeguard or product Rather, computer security is achieved ... Awareness of Security Issues o What news sources you use to stay abreast of new security risks? Resources include: Page Computer and Network Security: Questions Everyone Should Ask o Security- related ... world security requires constant vigilance Page Computer and Network Security: Questions Everyone Should Ask Scope of this Document This document provides a guide for discussions among computer...

Ngày tải lên: 05/03/2014, 23:20

... Fundamentals of Wired and Wireless Networks, Kameswari Chebrolu and Bhaskaran Raman, 09­13 May 2005 Security Guarantees ● Two possibilities: – – ● Unconditional Computational security Unconditional security: an example – ● One-time tape Most systems have computational security – How much security ... Key Distribution Centre (KDC): all eggs in one basket – ● Link encryption Multiple KDCs: better security Key management easier in public key cryptography Fundamentals of Wired and Wireless Networks, Kameswari Chebrolu and Bhaskaran Raman, 09­13 May 2005...

Ngày tải lên: 05/03/2014, 23:20

... Aspects of Security  consider aspects of information security:    security attack security mechanism security service Security Attack      any action that compromises the security of ...  pervasive security mechanisms:  trusted functionality, security labels, event detection, security audit trails, security recovery Model for Network Security Model for Network Security  using ... resources trusted computer systems may be useful to help implement this model Summary  have considered:  definitions for: • computer, network, internet security  X.800 standard  security attacks,...

Ngày tải lên: 06/03/2014, 16:20

...  select plaintext or ciphertext to en/decrypt More Definitions  unconditional security   no matter how much computer power or time is available, the cipher cannot be broken since the ciphertext ...     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...

Ngày tải lên: 06/03/2014, 16:20

... 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 ... advance of need good for bursty high speed links  random access to encrypted data blocks  provable security (good as other modes)  but must ensure never reuse key/counter values, otherwise could ... S[i]) (mod 256) swap(S[i], S[j]) t = (S[i] + S[j]) (mod 256) Ci = Mi XOR S[t] RC4 Overview RC4 Security  claimed secure against known attacks  have some analyses, none practical  result is...

Ngày tải lên: 06/03/2014, 16:20

... for large networks, but must trust each other session key lifetimes should be limited for greater security use of automatic key distribution on behalf of users, but must trust system use of decentralized ... mod m   given suitable values of parameters can produce a long random-like sequence suitable criteria to have are:      function generates a full-period generated sequence should appear ...     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 given any run of bits slow, since very...

Ngày tải lên: 06/03/2014, 16:20

Ngày tải lên: 06/03/2014, 16:20

... 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 ...   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) ... probabilistic test exponents e, d are inverses, so use Inverse algorithm to compute the other RSA Security  possible approaches to attacking RSA are:  brute force key search (infeasible given...

Ngày tải lên: 06/03/2014, 16:20

... room containing the computer – Physical aspects of security • Controlling who is allowed to make changes to a computer system (both its hardware and software) – Social aspects of security 1/9/07 ... to answer the questions: – What is computer security? – What we mean by a secure program? • Historical context – Basic definitions & background – Examples of security • General principles of secure ... examples 1/9/07 CIS/TCOM 551 11 Slashdot Security Headlines in 2007 • • • • • • • • • • • • • • • • Microsoft Gets Help From NSA for Vista Security NYT Security Tip - Choose Non-Microsoft Products...

Ngày tải lên: 14/03/2014, 20:20

... CS595-Cryptography and Network Security Network Security Model Trusted Third Party principal principal Security transformation Security transformation opponent CS595-Cryptography and Network Security Cryptography ... Enhances the security of data processing and transferring ! Security " Detect, mechanism prevent and recover from a security attack CS595-Cryptography and Network Security Important Features of Security ... and Network Security Attack: Fabrication CS595-Cryptography and Network Security Attacks, Services and Mechanisms ! Security " Action ! Security Attacks compromises the information security Services...

Ngày tải lên: 14/03/2014, 20:20

... information security vulnerabilities and exposures CIAC (Computer Incident Advisory Capability) at http://ciac.llnl.gov CSI (Computer Security Institute) at http://gocsi.com DFNCERT (German Computer ... http://www.auscert.org.au Bugtraq and Security Focus at http://www.securityfocus.com BugTraq is a full-disclosure, moderated mailing list providing detailed discussion and announcement of computer security vulnerabilities: ... http://www.sans.org Security Portal at http://www.securityportal.com USENIX Advanced Computing Systems Association at http://www usenix.org Security fixes and patches Monitor security fixes and patches...

Ngày tải lên: 14/03/2014, 22:20

... of Security Aspects of information security:  Security attack  Security mechanism  Security service  Note:  Threat – a potential for violation of security  Attack – an assault on system security, ... Overview Computer Security Concepts OSI Security Architecture Security Attacks Security Services Security Mechanisms These slides are based on Lawrie ... sci.crypt.random-numbers alt .security comp .security. misc, comp .security. firewalls, comp .security. announce comp.risks comp.virus Security and Cryptography Forum, http://forums.devshed.com /security- and-cryptography-17/...

Ngày tải lên: 14/03/2014, 22:20

... claimed user Publicly Available Directory  can obtain greater security by registering keys with a public directory  directory must be trusted with properties:       contains {name,public-key} ... computations are roughly equivalent hence for similar security ECC offers significant computational advantages Comparable Key Sizes for Equivalent Security Symmetric scheme (key size in bits) 56 ECC-based ... usually with other info such as period of validity, rights of use etc with all contents signed by a trusted Public-Key or Certificate Authority (CA)  can be verified by anyone who knows the public-key...

Ngày tải lên: 15/03/2014, 17:20

... 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 ... Symmetric Encryption  as discussed previously can use a two- level hierarchy of keys  usually with a trusted Key Distribution Center (KDC)    each party shares own master key with KDC KDC generates ... EPRas[IDB||PUb||T] || EPUb[EPRas[Ks|| T]]   note session key is chosen by A, hence AS need not be trusted to protect it timestamps prevent replay but require synchronized clocks One-Way Authentication...

Ngày tải lên: 15/03/2014, 17:20