On the Reliability of Cryptopometry
Laurence Oâ€™Toole and
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Thomas Martin: Information Security Program, Khalifa University, Abu Dhabi, UAE
Laurence Oâ€™Toole: Information Security Group, Royal Holloway, University of London, London, UK
Andrew Jones: Information Security Program, Khalifa University, Abu Dhabi, UAE
International Journal of Digital Crime and Forensics (IJDCF), 2013, vol. 5, issue 1, 27-38
Forensics investigators encounter many challenges when it comes to digital evidence: the constantly changing technology that may store evidence, the vast amounts of data involved, and the increasing use of encryption. Cryptography, when used correctly, can prevent any useful information from being retrieved and is encountered in the use of communication protocols, whole-disk encryption, password managers, and so forth. There are some techniques that can assist the investigator when encountering encrypted material. Simple password-based systems can be brute-forced, and live memory capture can obtain key material directly. It has been suggested that the ciphertext length can be used to conclusively determine the plaintext (McGrath, Gladyshev, & Carthy, 2010). In this paper, the authors devise an experiment to test this claim. Based on the results, they argue that there are flaws with this approach.
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