active defense a comprehensive guide to network security

... To ensure that the security update or patch is applied as soon as it is available, turn on Automatic Updates. Other than operating system updates, Automatic Updates also downloads all high-priority ... you can store all of your critical data files on a separate, encrypted disk volume and then access those data files by associating a drive letter... Install antimalware software Install a ... suggests creating unique variations of the same password A property of Know How Media MALWARE RESEARCH AND ANALYSIS Malware, a portmanteau from the words malicious and software, is software...

Ngày tải lên: 21/02/2015, 07:09

... Active Machines After an attacker knows what the IP address range is, he wants to know which machines are active and which ones are not In a lot of cases, a company gets an address range that ... such as banks, the company wants to know the threat it has to external attackers and the points of vulnerability without giving away any information Basically, these companies want to simulate an ... potential damage the whois lookup can cause Remember that you need to have a domain record and that data has to be somewhat valid because that is what people use to contact you or your company The

Ngày tải lên: 14/08/2014, 18:20

... the party he is spoofing can be at home or away on vacation for that matter—the real user plays no role in the attack. Therefore, the attacker is not actively launching an attack against a user’s ... Session Hijacking With hijacking, there are two basic types of attacks: active and passive. With a passive attack, an attacker hijacks a session, but just sits back and watches and records all of ... different from a hijack in that an attacker is not actively taking another user offline to perform the attack. Instead, he pretends to be another user or machine to gain access. While an attacker is

Ngày tải lên: 14/08/2014, 18:20

... attack, and a separate program to run a land attack, they are all combined into one program In this section, we look at Targa, which is used to launch a variety of DOS attacks Targa Targa is a ... front to build an appropriate infrastructure Not only can DOS attacks cause a lot of damage, but there are also tools available, such as Targa and TFN2K, that make launching a DOS or DDOS attack a ... Needless to say, Targa is a very powerful program and can do a lot of damage to a company’s network Installing Targa Targa is very easy to install When you download Targa, you download a single

Ngày tải lên: 14/08/2014, 18:20

... company wants to take a strong stance on security and be able to take legal action against an individual, it needs clearly documented policies For example, let’s say that an attacker breaks into ... letter a and try aa, ab, ac, and so on; then you try aaa, aab, aac, and so on I think you get the Trang 23On the other hand, an administrator has to determine which is the greater risk— having a minimum ... like password lockout, which most companies use to increase their security, and show how it can actually allow an attacker to launch a Denial of Service attack against a company What Is Password

Ngày tải lên: 14/08/2014, 18:20

... do a lot of damage Keep Inventory of Active Accounts Active accounts that belong to people that are on leave or are no longer at a company present a huge vulnerability These accounts are easy ... an extra step and extra access for the user To run Crack on such a system, an attacker must have root access to read the shadow file or some way to acquire a copy of the file After you have a ... the administrators involved, so I explained to them that I was going to extract and crack the passwords They assured me that this was a waste of time, because they had already run Crack and did

Ngày tải lên: 14/08/2014, 18:20

... causes a wildcard name query request to be broadcast at startup, and each machine that responds to the name query is sent an adapter status request. The /ASTAT command-line option causes an ... is a program that can be used in a malicious manner. When used to enumerate shares on an NT system, Legion takes advantage of the fact that a default installation of an NT system allows anonymous ... 12.12 Legion automatically... When the user wants to attempt a brute force password cracking attack (which in reality is a dictionary attack) against a NetBIOS share with share-level access,

Ngày tải lên: 14/08/2014, 18:20

... wants to be able to get back into the system whenever he wants For example, if an attacker breaks into a site, to use it as a launching pad to break into other systems, he wants to be able to ... be able to prevent every attack; but to have a secure network, it is critical to detect attackers before they create backdoors into the system If the attacker is able to create a backdoor, a company ... system, he wants to make it easier to get back in at a later time One of the most common ways to create a backdoor is by opening up a port that has a listening agent attached These programs are covered

Ngày tải lên: 14/08/2014, 18:20

... easy tool for an administrator to determine that unauthorized access was gained and what the attacker did Therefore, from an attacker’s standpoint, he wants to clean up the files and hide what ... be able to change the logs because they are stored on a different system He would have to break into a separate system to change the logs The more systems an attacker has to break into the harder ... gain additional access on the machine or to attack other machines Often an attacker will break into a machine not for access to the data, but for access to the computer’s resources If a company

Ngày tải lên: 14/08/2014, 18:20

... recommends that all Cisco IOS devices implement the authentication, authorization, and accounting (AAA) security model. AAA can use local, RADIUS, and TACACS+ databases”. This is a good recommendation ... network can be stored and reviewed in a central location. 2. Attack the tftp server. In this scenario, the attacker could try to attack and gain access to a tftp server to gain access to several ... in a similarly to the way L0phtcrack decrypts Windows NT passwords. Rather than trying to obtain a copy of a Windows NT SAM file, an attacker tries to obtain a copy of the encrypted type 7 password

Ngày tải lên: 14/08/2014, 18:20

... 2Security+ Guide to Network SecurityFundamentals, Third Edition Mark Ciampa Vice President, Career and Professional Editorial: Dave Garza Executive Editor: Stephen Helba Managing Editor: Marah Bellegarde ... study aid Trang 16xvi • Today’s Attacks and Defenses Each chapter opens with a vignette of an actual security attack or defense mechanism that helps to introduce the material covered in that chapter ... It alsolooks at the different categories of attacks and the methods of attacks that are commonlyunleashed against networks today Chapter 5, “Network Defenses,” examines how to create a secure network

Ngày tải lên: 27/05/2018, 21:07

... The Advaita Vedanta written in Sanskrit (ca 5000 BC) talks about sleep and wakefulness and the different states were termed avasthas; avasthatraya—the three states, namely waking state ( jagrat), ... “ashwagandha” to cure insomnia [49a] Ashwagandha, also known as Withania somnifera in Latin or “Indian winter cherry” or “Indian ginseng,” contains steroidal lactones, anaferine, and heterogonous alkaloids, ... Diagnostic and Statistical Manual of the American Psychiatric Association (1994; DSM-IV) classi- 25  The Insomnias: Historical Evolution fied insomnia into primary insomnia and that related to

Ngày tải lên: 22/01/2020, 01:18

... How to Use Cryptography • Cryptography can provide a major defense against attackers • If an e-mail message or data stored on a file server is encrypted, even a successful attempt to steal that ... Defining Hashing • Hashing, also called a one-way hash, creates a ciphertext from plaintext • Cryptographic hashing follows this same basic approach • Hash algorithms verify the accuracy of a value ... without transmitting the value itself and subjecting it to attacks • A practical use of a hash algorithm is with automatic teller machine (ATM) cards Defining Hashing (continued) Diffie-Hellman •

Ngày tải lên: 30/01/2020, 10:49

... directory service for Windows • Active Directory is stored in the Security Accounts Manager (SAM) database • The primary domain controller (PDC) houses the SAM database Trang 32Hardening Networks• ... servers “lease” IP addresses to clients Trang 30Hardening Data Repositories• Data repository: container that holds electronic Trang 31Hardening Data Repositories (continued)• Active Directory is ... Trang 1Chapter 4: Security BaselinesSecurity+ Guide to Network Security Fundamentals Second Edition Trang 2• Disable nonessential systems • Harden operating systems • Harden applications • Harden

Ngày tải lên: 30/01/2020, 11:53

... Identification (continued) • A valuable tool used in threat modeling is the construction of an attack tree • An attack tree provides a visual image of the attacks that may occur against an asset ... when an attack penetrates the security defenses • A team must respond to the initial attack and reexamine security policies that address the vulnerability to determine what changes need to be made ... scenarios of the types of threats that assets can face • The goal of threat modeling is to better understand who the attackers are, why they attack, and what types of attacks may occur Threat

Ngày tải lên: 30/01/2020, 12:05

... algorithms include Data Encryption Standard, Triple Data Encryption Standard, Advanced Encryption Standard, Rivest Cipher, International Data Encryption Algorithm, and Blowfish • Disadvantages of symmetric ... Managing Digital Certificates • After a user decides to trust a CA, they can download the digital certificate and public key from the CA and store them on their local computer • CA certificates ... can refer to this directory to see changes • Can provide the information in a publicly accessible directory, called a Certificate Repository (CR) • Some organizations set up a Registration Authority

Ngày tải lên: 30/01/2020, 12:10

... three major parts: – An antenna and a radio transmitter/receiver to send and receive signals – An RJ-45 wired network interface that allows it to connect by cable to a standard wired network ... server adds an accounting record to its log and acknowledges the request • Allows company to maintain user profiles in a central database that all remote servers can share Trang 19Terminal Access ... Control Access Control System (TACACS+) • Industry standard protocol specification that forwards username and password information to a centralized server • Whereas communication between a NAS and a

Ngày tải lên: 30/01/2020, 12:12

... penalties • Laws include: – The Health Insurance Portability and Accountability Act of 1996 (HIPAA) – The Sarbanes-Oxley Act of 2002 (Sarbox) – The Cramm-Leach-Blilely Act (GLBA) – USA PATRIOT ... preventing data theft as primary goal of information security Trang 14Preventing Data Theft (continued) • Theft of data is single largest cause of financial loss due to a security breach • One ... computer (such as a personal computer), stored on a magnetic or optical storage device (such as a hard drive or DVD), and transmitted over a network spacing Defining Information Security Trang 9• Ensures

Ngày tải lên: 30/01/2020, 12:20

... reading an e-mail message, to start the infection Worms (continued) • Worms are usually distributed via e-mail attachments as separate executable programs • In many instances, reading the e-mail ... attempts to learn a user’s password by a variety of means • Cryptography uses an algorithm and keys to encrypt and decrypt messages Summary (continued) • Identity attacks attempt to assume the ... Chapter 2: Attackers and Their Attacks Security+ Guide to Network Security Fundamentals Second Edition Objectives • Develop attacker profiles • Describe basic attacks • Describe identity attacks

Ngày tải lên: 30/01/2020, 12:27

... (fault tolerance) can keep systems available to an organization • Prevents a single problem from escalating into a total disaster • Can best be achieved by maintaining redundancy • Fault-tolerant ... server hard drives are based on a standard known as Redundant Array of Independent Drives (RAID) Trang 27Creating and Maintaining Backups• Data backups are an essential element in any BCP • Backup ... defenses against social engineering are a strong security policy along with adequate training • An organization must establish clear and direct policies regarding what information can be given out and

Ngày tải lên: 30/01/2020, 12:39