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Port knocking from the inside out
Leaving a port open to the public is like an invitation for an intruder. Unfortunately, most services such as HTTP or SMTP need to be open for everyone to see. However, some of the more critical services may be accessible only when required. Here's where port knocking comes in. [ level:
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Total control – low-level network access
Developing applications that directly access layers of the ISO/OSI model can be a difficult task, frequently requiring non-standard packet formatting. Help is at hand, however, in the form of the WinPcap and libnet libraries, which put the programmer in total control of the content being sent out into the network. [ level:
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Attacks on layer two of the OSI model
Layer two of OSI model is one of the weakest links when trying to assure network security in an organization. It is also one of the most commonly ignored, because there aren't many public implementations of layer two attacks. However, a successful attack on layer two can be just as dangerous as any other. [ level:
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Wi-Fi security – WEP, WPA and WPA2
Wi-Fi (Wireless Fidelity) is one of today’s leading wireless technologies. However, one configuration aspect all too often goes unnoticed: security. Let's have a closer look at the level of security of encryption methods used in modern Wi-Fi implementations. [ level:
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Detouring network firewalls
Firewalls also have their weaknesses and detouring them, both due to misconfiguration and due to product weaknesses, is possible. Oliver describe how an intruder can gain access to a system by detouring a firewall. [ level:
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Security Tools – Sendip
SendIP makes it possible to prepare and send network packets using the NTP, BGP, RIP, RIPng, TCP, UDP and ICMP protocols, as well as raw IPv4 and IPv6 packets with user-supplied parameters and arbitrary data. [ level:
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Voice over IP security - SIP and RTP protocols
We provide a detailed overview of protocols used in Voice over IP (VoIP) transmissions, particularly of the SIP protocol. Then we take a look at seven most common, most effective and best-described methods of attacking VoIP, and how these methods can be applied in practice. [ level:
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Security Tools - Firestarter 1.0.3
A graphical interface for creating simple rules for a netfilter/iptables-based firewall. [ level:
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