Xem 1-20 trên 390 kết quả Security Attack
  • Security Attack: Any action that compromises the security of information. Security Mechanism: A mechanism that is designed to detect, prevent, or recover from a security attack. Security Service: A service that enhances the security of data processing systems and information transfers. A security service makes use of one or more security mechanisms.

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  • Network Security: Chapter 1 - Introduction provides about Background, Definitions, Aim of Course, Security Trends, OSI Security Architecture, Aspects of Security, Security Attack, Classify Security Attacks, Types of Attacks, Passive Attacks, Security Services.

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  • Midterm Review Cryptography & Network Security - Nguyen Cao Dat Introduction (OSI Security Architecture, Security Attack, Security mechanism,...); Basics of Cryptography (Symmetric cipher, Public key cryptography, Message authentication, Digital signatures).

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  • Network Security: Attacks Overview - Nguyen Cao Dat includes about Cryptographic Attacks (Frequency analysis, Brute force attack, Meet-in-the-middle attack, Birthday attack); Network Attacks (Replay attack, Man-in-the-middle attack, Denial-of-service attack).

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  • OSI, TCP/IP model o IP, TCP packet architecture o Protocols: HTTP, DNS… Network devices, router, switch, firewall, … Wireless network: AP, wave,… Overview of network security o o o o o o o Definitions Tasks of Network Security Attacks, services and mechanisms Security attacks Security services Methods of Defense A model for Internetwork Security 3 .OSI model 4 .TCP/IP model 5 .

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  • Web applications suffer more than their share of security attacks. Here’s why. Websites and the applications that exist on them are in some sense the virtual front door of all corporations and organizations. Growth of the Web since 1993 has been astounding, outpacing even the adoption of the television and electricity in terms of speed of widespread adoption. Web applications are playing a growing and increasingly prominent role in software development. In fact, pundits currently have us entering the era of Web 3.0 (see http: //www.informit.com/articles/article.aspx?p=1217101).

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  • Web now widely used by business, government, individuals but Internet & Web are vulnerable have a variety of threats integrity confidentiality denial of service authentication need added security mechanisms

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  • WPA: A rush solution to the security problems of WEP WPA2: Based on 802.11i (official version) Encrypt and authenticate MSDUs: counter mode-CBC MAC protocol with AES-128 Authenticate STAs: 802.1X Initialization vectors transmitted in plaintext are no longer needed to generate per-frame keys But most of the existing Wi-Fi WPA cards cannot be upgraded to support 802.11i

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  • At cats' green on the Sunday he took the message from the inside of the pillar and added Peter Moran's name to the two names already printed there in the "Brontosaur" code. The message now read: “Leviathan to Dragon: Martin Hillman, Trevor Allan, Peter Moran: observe and tail.” What was the good of it John hardly knew. He felt better, he felt that at last he had made an attack on Peter Moran instead of waiting passively and effecting no retaliation. Besides, what was the use of being in possession of the key to the codes if he never took...

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  • Every day I read e-mails and articles dealing with computer security attacks and breaches, and the repercussions that follow. I have been getting onboard with computer security for decades, and there is no end in sight for this effort. Each and every professional in information technology has a commitment to keep with regard to computer security. We have, most of us, signed computing codes of conduct, and further we have aligned ourselves with those who protect the computing resources of our respective companies....

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  • There are a number of strategies that allow an attacker to break the circle of trust and get into people’s contact lists. A lot of social network users do not realize that their contact lists really is a circle of trust and by adding somebody they do not know—celebrities included—they are opening their data to untrusted parties. Some sites do not have privacy controls in place, or the ones they have do not protect all user data. Even if they do have comprehensive privacy controls, the user is often not obligated to select who can access his/her data and is often...

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  • Encryption and authentication algorithms are building blocks of secure network protocols Deploying cryptographic algorithms at different layers have different security effects Where should we put the security protocol in the network architecture?

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  • Secure Socket Layer Protocol (SSL) Designed by Netscape in 1994 To protect WWW applications and electronic transactions Transport layer security protocol (TLS) A revised version of SSLv3 Two major components: Record protocol, on top of transport-layer protocols Handshake protocol, change-cipher-spec protocol, and alert protocol; they reside between application-layer protocols and the record protocol

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  • Radio based communication, open air The attacker, having a radio transmitter and receiver with the same radio frequency of the underlying wireless network, can easily: Intercept wireless data Connect his computing devices to a nearby wireless network Inject new packets to an existing wireless network Jam a particular wireless channel using a jamming device Security measures Implement encryption algorithms, authentication algorithms, and integrity-check algorithms at the data-link layer Provide network access with wired equivalent privacy Higher-layer protocols and applications can be used ...

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  • Never trust user input Poorly or unvalidated user input constitutes the most severe security problem with web applications can crash a server can cause buffer overflows can allow machine to be hijacked allow hacker to have root access Assume user input is bad until you prove its OK

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  • transport layer security service originally developed by Netscape version 3 designed with public input subsequently became Internet standard known as TLS (Transport Layer Security) uses TCP to provide a reliable end-to-end service SSL has two layers of protocols

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  • This chapter includes contents: To discuss security threats and attacks; to explain the fundamentals of encryption, authentication, and hashing; to examine the uses of cryptography in computing; to describe the various countermeasures to security attacks.

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  • In CERTs 2001 annual report it listed 52,000 security incidents the most serious involving: IP spoofing intruders creating packets with false address then taking advantages of OS exploits eavesdropping and sniffing attackers listen for userids and passwords and then just walk into target systems as a result the IAB included authentication and encryption in the next generation IP (IPv6)

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  • Biggest problem is figuring out who a piece of mail is really from Must use a higher level mechanism for trust or privacy Most SMTP clients use sendmail which has been a constant source of security problems for years

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  • The art of war teaches us to rely not on the likelihood of the enemy's not coming, but on our own readiness to receive him; not on the chance of his not attacking, but rather on the fact that we have made our position unassailable. —The Art of War, Sun Tzu

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