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Full-Text Articles in Physical Sciences and Mathematics
Steganographic Schemes For File System And B-Tree, Hwee Hwa Pang, Kian-Lee Tan, Xuan Zhou
Steganographic Schemes For File System And B-Tree, Hwee Hwa Pang, Kian-Lee Tan, Xuan Zhou
Research Collection School Of Computing and Information Systems
While user access control and encryption can protect valuable data from passive observers, these techniques leave visible ciphertexts that are likely to alert an active adversary to the existence of the data. We introduce StegFD, a steganographic file driver that securely hides user-selected files in a file system so that, without the corresponding access keys, an attacker would not be able to deduce their existence. Unlike other steganographic schemes proposed previously, our construction satisfies the prerequisites of a practical file system in ensuring the integrity of the files and maintaining efficient space utilization. We also propose two schemes for implementing …
Optimisation Of John The Ripper In A Clustered Linux Environment, Christian Frichot
Optimisation Of John The Ripper In A Clustered Linux Environment, Christian Frichot
Theses : Honours
To aid system administrators in enforcing strict password policies, the use of password cracking tools such as Cisilia (C.I.S.I.ar, 2003) and John the Ripper (Solar Designer, 2002), have been employed as software utilities to look for "weak" passwords. John the Ripper (JtR) attempts to crack the passwords by using a dictionary, brute-force or "other" mode of attack. The computational intensity of cracking passwords has led to the utilisation of parallel-processing environments to increase the speed of the password-cracking task. Parallel-processing environments can consist of either single systems with multiple processors, or a collection of separate computers working together as a …