Researchers have developed a method (pdf) by which they are able to record the sound of a dot matrix printer in operation and recreate the information that was printed based on the audio data. Data leakage from electronic devices isn’t new (TEMPEST comes to mind). However, it seems like the higher-profile methods tend to encompass electromagnetic properties rather than mechanical properties.
MD5 is a hashing algorithm created in 1991 and still used by many applications for certain features. But MD5 is no longer recommended for many cases due to weaknesses discovered in the last few years, opening up some scary possibilities. At the end of this year, NIST standards for cryptography used by the federal government will no longer permit 160-bit SHA1 hashes or 1024-bit RSA signature keys, since concerns over the long-term security of these technologies are rising. With cryptographers constantly working on new algorithms and breaking old algorithms, one may get nervous about whether the foundations of today’s secure transactions are really that secure. But despite the occasional ominous forecast of a cryptographic meltdown, you can remain fairly confident[…]
According to an article published last week, it is apparently possible to construct a signed PDF that can have its underlying data changed such that the signature is still valid, but the presentation of the data is changed. It’s a neat trick, but there are a few things that mitigate the risk inherent in the vulnerability: The signature has to be applied to a carefully crafted PDF file. A PDF file that you create and sign is unaffected by this attack; if you examine the data within the file, the presentation data for both the “recommendation” and “order” documents is present in both. Obviously, you will not be adding rogue data into your own PDFs before signing them. As stated[…]
So you’ve been hearing lately about how some Android applications are going rogue, and being used to steal user’s data and infiltrate their phones, to sit idly by only to wreak havoc when the user least expects it (ok, so maybe I exaggerated a little there). But there has been a lot of buzz lately about certain apps not playing by the rules, or including certain calls to leach user information. A lot of this buzz has been spun as backlash against Google for allowing these types of applications to exist (instead of having some asininely draconian filtering process like some ‘other’ phone provider).
Risk assessment gets a bad rap these days, thanks in large part to a checkered past colored by qualitative analyses. Historically, risk assessments have been fuzzy, at best, and down-right inaccurate and misleading at worst. You know the ones I’m talking about: some hot shot consultant comes in, pokes around, maybe runs a couple scans, and then churns out a report with a bunch of High, Medium, and Low findings. However, as you dig into the results – particularly the so-called “High Risk” findings – you start finding extreme squishiness with no connection to reality, rational thought, or logic. And this is what we’re supposed to use to “better manage” security? Don’t think so… Enter Factor Analysis of Information Risk[…]
With a new version of Backtrack around, many people may be ready to take the plunge into learning it. This is a little late for those of you who decided to try it at Blackhat/Defcon, but ShmooCon will be coming up in a few months… Apt is the debian packaging system. It’s found in all debian based Linux distros – like K/Ubuntu and Backtrack. If you’re going to be at a hacker conference, the least you can do is update your system before you go! Packages are generally GPG signed by the maintainer, and debian keeps a list of trusted GPG keys updated on your system (debian-keyring debian-archive-keyring are the debian specific packages). Apt checks these signatures to help ensure[…]