What is “Information Security” anyway?

by Simon Biles

"So what is "Information Security" anyway? The traditional model that is taught to all InfoSec newbies is based around the “CIA Triad” – this isn’t some weird American-Chinese governmental underground society – rather it is the “holy trinity” of Confidentiality, Integrity and Availability that is used to define security. It’s been around for over 20 years, and, dig as I might, I couldn’t find the original source ( if anyone knows – please tell me ! ), it hasn’t stood unchallenged – more of that later – but certainly it is still in daily use, and, if your InfoSec professional doesn’t know what it stands for, it’s time to get a new professional ! In any case, it isn’t a bad place to start, so here are the component parts for you…"

Read more at http://www.forensicfocus.com/simon-biles

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File timestamps are used by forensics practitioners as a fundamental artifact. For example, the creation of user files can show traces of user activity, while system files, like configuration and log files, typically reveal when a program was run.

Despite timestamps being ubiquitous, the understanding of their exact meaning is mostly overlooked in favor of fully-automated, correlation-based approaches. Existing work for practitioners aims at understanding Windows and is not directly applicable to Unix-like systems.

In this paper, we review how each layer of the software stack (kernel, file system, libraries, application) influences MACB timestamps on Unix systems such as Linux, OpenBSD, FreeBSD and macOS.

We examine how POSIX specifies the timestamp behavior and propose a framework for automatically profiling OS kernels, user mode libraries and applications, including compliance checks against POSIX.

Our implementation covers four different operating systems, the GIO and Qt library, as well as several user mode applications and is released as open-source.

Based on 187 compliance tests and automated profiling covering common file operations, we found multiple unexpected and non-compliant behaviors, both on common operations and in edge cases.

Furthermore, we provide tables summarizing timestamp behavior aimed to be used by practitioners as a quick-reference.

Learn more: https://dfrws.org/presentation/a-systematic-approach-to-understanding-macb-timestamps-on-unixlike-systems/

YouTube Video UCQajlJPesqmyWJDN52AZI4Q_i0zd7HtluzY

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