¶ … wartime communication, business operations, or protecting oneself from identity theft, secure communication via the Internet is a top priority. Every day, malicious users are creating and releasing new forms of malware that are increasingly difficult to detect and combat. Many of these hackers are motivated by a desire to steal private information -- a crime that can be devastating to any victim. Fortunately, many "good guys" are also working to protect this information. Cryptography, authentication, message integrity, and operational security are the main focus of their work. Other issues include how to secure network layers for specific operations: email, TCP connections, the network layer, or a wireless LAN . The war against cyber criminals of all kinds is an exciting and vibrant area of research and development; this mission poses greater and greater challenges to scientists as criminals perfect their craft . So what are malicious internet abusers getting away with? Their crimes include eavesdropping, compromising data, stealing passwords and other personal information, identity theft, and denial of service attacks. For most of these crimes, the initial response has been to encrypt messages or data in order to prevent successful interception. Although cryptography techniques date back thousands of years, many of the most exciting advancements have taken place recently in response to more sophisticated criminal activity. Encryption algorithms combined with secret "keys" are used to code information before transmission; the receiving end must then be able to decode the message for comprehension. Historical encryption algorithms include: the basic Caesar cipher, monoalphabetic cipher, and polyalphabetic encryption. Corresponding methods of attack are known as ciphertext-only attacks, known-plaintext attacks, and chosen-plaintext attacks. A standard in email encryption schemes still used today is Zimmerman's Pretty Good Privacy (PGP), software which...
In the case of TCP connections, security has traditionally been provided by a modified version of TCP known as Secure Sockets Layer (SSL), or the newer Transport Layer Security (TLS). These security protocols also involve the use of secret keys. When it comes to network-layer security, the standard is known as the IPsec, or the IP security protocol. IPsec works by securing IP datagrams between network-layer entities; it is often used to create virtual private networks (VPNs). Another network domain where security measures are imperative is the wireless LAN. The initial standard for wireless security is the IEEE 802.11 Wired Equivalent Privacy (WEP) protocol, which employs a "symmetric shared key approach" to provide authentication and encryption. This protocol has since been replaced by an improved version, the IEEE 802.11i. Finally, current network security issues revolve around firewalls, intrusion detection and prevention systems, and other modes of operational security. Traditional techniques employed in this realm involve packet filters, application gateways, and deep packet inspection. Clearly, computer scientists have well-established and sufficiently successful network security protocols in place on many levels: so why is malware still such a threat?
Another aspect of the security management area of a network management system is the development of policy-based auditing and alerts by role in the organization (Merilainen, Lemmetyinen, 2011). This is one of the areas of knowledge-enabled security management, specifically in the area of role-based access and advanced auditing and reporting. Fault management is also an area that no single suite of network management systems can completely meet per the ISO standards
Network Management and System Administration The aim of the paper is to establish the difference between a system administrator and a network administrator. The paper is thus divided into three sections. The first section deals with the basic definition and responsibilities of a system administrator; the second does the same for a network administrator and the third compares their responsibilities to clearly identify the differences between the two. System Administrator The maintenance of
). Such security should also preplan strategic responses to attacks associated with the network (Dawkins et al.). A book entitled "Surviving Security: How to Integrate People, Process, and Technology" explains that the rapid expansion networking and networking technologies necessitates greater security needs. The author asserts that parts of the network such as routers, switches and even network printers are vulnerable (Andress). The article further explains that the router or switch contained
competitive, fast-paced business world, a network failure can be disastrous. The pressure placed on network administrators to fix issues immediately is daunting; these important players need all the tools they can get to troubleshoot, prevent, and repair problems. Network administrators must remain vigilant and work constantly to monitor for interface or host failures, detect route flapping or intrusions, perform LAN segment switches or bandwidth adjustments, and monitoring overall performance
Network Design The process of gathering technical requirements for a network design project may differ from one organization to another, but the requirements themselves can be described using many of the concepts discussed in the lecture this week (i.e. Scalability, Availability, Network performance, Security, Manageability, and Affordability). Analyzing technical requirements for the customer is important in helping one best fulfill the customer's expectations. The various objectives that need to be fulfilled involve
Network Design Proposal Network Requirements ABC School Stats/User Counts Having a current strength of approximately 845 students, ABC School provides education from Pre-Kindergarten to the 12th Grade. According to the requirements of The New York School District, 250 Curriculum computers along with 75 Administration computers are to be installed. The requirements for the wiring per room of layer 1 are that it should adjust a total of 25 computers, 24 of which will
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