Defensive techniques

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  • We now begin our look at building protocols using the basic tools that we have discussed. The discussion in this lecture will focus on issues of key establishment and the associated notion of authentication These protocols are not real, but instead are meant to serve just as a high-level survey Later lectures will go into specific protocols and will uncover practical challenges faced when implementing these protocols

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  • The goal of Defensive Programming is to produce resilient code that responds gracefully to the unexpected. To the SQL Server programmer, this means T-SQL code that behaves consistently and predictably in cases of unexpected usage, doesn't break under concurrent loads, and survives predictable changes to database schemas and settings. Inside this book, you will find dozens of practical, defensive programming techniques that will improve the quality of your T-SQL code and increase its resilience and robustness. ...

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  • Forge a connection to a host running chargen and have it send useless chargen data to the echo server on another makes the 2 services so busy that the host may crash or be too busy to respond to normal traffic Defense: configure only services that are absolutely necessary (chargen and echo have no business running on a production server)

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  • In contrast to other animals, humans sense their world chiefly by vision, sound, and touch. We have, in general, a remarkably undeveloped sense of smell, and so it is not surprising that we fail to appreciate how important chemical signals are in the lives of other organisms. Chemical signals and cues serve insects in numerous ways, including sexual advertisement, social organization, defense, and finding and recognizing resources.

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  • A knife is the first weapon given to a Ninja. He or she learns Tanto-jitsu, knife art. As well as becoming an expert in hand-to-hand combat, a Ninja learns to throw knives, as well as many other objects. But some knives are designed specifically for throwing. With such specialty knives, the Ninja knife ...

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  • Defense in Depth is practical strategy for achieving Information Assurance in today’s highly networked environments. It is a “best practices” strategy in that it relies on the intelligent application of techniques and technologies that exist today. The strategy recommends a balance between the protection capability and cost, performance, and operational considerations. This paper provides an overview of the major elements of the strategy and provides links to resources that provide additional insight....

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  • Security-Enhanced Linux (SELinux) is an implementation of mandatory access control using Linux Security Modules (LSM) in the Linux kernel, based on the principle of least privilege. It is not a Linux distribution, but rather a set of modifications that can be applied to Unix-like operating systems, such as Linux and BSD.

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  • SIP is a lightweight, transport-independent, text-based protocol. SIP has the following features: Lightweight, in that SIP has only four methods, reducing complexity Transport-independent, because SIP can be used with UDP, TCP, ATM & so on. Text-based, allowing for low overhead SIP is primarily used for VOIP calls

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  • Cho phép nhập theo phiên âm Acacia tree species that grows fast, capable of improving land. The tree has thick foliage good defense capability. Wood is hard core, dark, fine grained, used as timber, timbering, flooring, plywood, pulp, firewood and charcoal. characteristics Tall trees, up to 30 environment. Strong capacity for regeneration. Acacia leaves large, there are four main tendons, leaves Acacia auriculiformis long, slightly curved, narrow and has two main tendons. Acacia hybrid between the two types of intermediate leaves Acacia auriculiformis and Acacia midrib with 3-4.

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  • libpcap is an open source C library for putting your NIC in promiscuous mode. Today I’ll go over a few C gotchas and how to use the libpcap API Any C programmers? Planning to go to grad school?

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  • RFC-1631 A short term solution to the problem of the depletion of IP addresses Long term solution is IP v6 (or whatever is finally agreed on) CIDR (Classless InterDomain Routing ) is a possible short term solution NAT is another NAT is a way to conserve IP addresses Hide a number of hosts behind a single IP address Use: 10.0.0.0-10.255.255.255, 172.16.0.0-172.32.255.255 or 192.168.0.0-192.168.255.255 for local networks

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  • Each of the messages, like each one he had ever read of Stern's commands, began with a number and ended with a number or row of numbers. No efforts on the part of Mungo or any of his experts had been able to break Stern's code, nor was there any clue as to what the preliminary number and those ultimate numbers signified. —Talking to Strange Men, Ruth Rendell

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  • Block ciphers are among the most widely used types of cryptographic algorithms provide secrecy and/or authentication services in particular will introduce DES (Data Encryption Standard)

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  • To guard against the baneful influence exerted by strangers is therefore an elementary dictate of savage prudence. Hence before strangers are allowed to enter a district, or at least before they are permitted to mingle freely with the inhabitants, certain ceremonies are often performed by the natives of the country for the purpose of disarming the strangers of their magical powers, or of disinfecting, so to speak, the tainted atmosphere by which they are supposed to be surrounded. —The Golden Bough, Sir James George Frazer ...

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  • will consider authentication functions developed to support application-level authentication & digital signatures will consider Kerberos – a private-key authentication service then X.509 - a public-key directory authentication service

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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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  • Root of Trust in a PC Operations or actions based on the TPM have measurable trust. Flexible usage model permits a wide range of actions to be defined. Doesn’t Control PC (About DRM) User still has complete control over platform. It’s OK to turn the TPM off (it ships disabled). User is free to install any software he/she pleases.

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  • Hidden malicious circuits provide an attacker with a stealthy attack vector. As they occupy a layer below the entire software stack, malicious circuits can bypass tra- ditional defensive techniques. Yet current work on trojan circuits considers only simple attacks against the hard- ware itself, and straightforward defenses. More complex designs that attack the software are unexplored, as are the countermeasures an attacker may take to bypass pro- posed defenses. We present the design and implementation of Illinois Malicious Processors (IMPs).

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  • Q: Are pings forwarded by routers? A: Yes! This is why you can ping devices all over the Internet. Q: Do all devices forward or respond to pings? A: No, this is up to the network administrator of the device. Devices, including routers, can be configured not to reply to pings (ICMP echo requests). This is why you may not always be able to ping a device. Also, routers can be configured not to forward pings destined for other devices.

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  • SQL injection attacks pose a serious security threat to Web appli- cations: they allow attackers to obtain unrestricted access to the databases underlying the applications and to the potentially sensi- tive information these databases contain. Although researchers and practitioners have proposed various methods to address the SQL injection problem, current approaches either fail to address the full scope of the problem or have limitations that prevent their use and adoption.

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