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Malicious software (malware) represents a major threat for computer systems of almost all types. In the past few years the number of prevalent malware samples has increased dramatically due to the fact that malware authors started to deploy morphing (aka obfuscation) techniques in order to hinder detection of such polymorphic malware by anti-malware(More)
In addition to preventive mechanisms intrusion detection systems (IDS) are an important instrument to protect computer systems. Most IDSs used today realize the misuse detection approach. These systems analyze monitored events for occurrences of defined patterns (signatures), which indicate security violations. Up to now only little attention has been paid(More)
Tracheostomy is a common surgical procedure, and is increasingly performed in the intensive care unit (ICU) as opposed to the operating room. Procedural knowledge is essential and is therefore outlined in this review. We also review several high-quality studies comparing percutaneous dilational tracheostomy and open surgical tracheostomy. The percutaneous(More)
Modern multi-tier application systems are generally based on high performance database systems in order to process and store business information. Containing valuable business information, these systems are highly interesting to attackers and special care needs to be taken to prevent any malicious access to this database layer. In this work we propose a(More)
Client-based attacks on internet users with malicious web pages represent a serious and rising threat. Internet Browsers with enabled active content technologies such as JavaScript are vulnerable to so-called drive-by downloads. Drive-by downloads are able to automatically infect a victim's system during a single visit of a crafted web page testing various(More)
Network steganography is the art of hiding secret information within innocent network transmissions. Recent findings indicate that novel malware is increasingly using network steganography. Similarly, other malicious activities can profit from network steganography, such as data leakage or the exchange of pedophile data. This paper provides an introduction(More)