I received an impressive email scam recently. My response was to forward it to the email provider’s abuse contact (email@example.com) and file a complaint with the Internet Crime Complaint Center (ic3.gov). I’ll include the whole email later. The bottom line: Scammer has my password and will humiliate me if I don’t pay $1900 in bitcoin.
The scammer’s email landed in my spam folder. I was given a deadline of July 11. I didn’t clean out my spam folder till today (July 15).
In fact, the scammer does have one of my passwords: a throwaway password I use with throwaway accounts. When a web site makes me “register for an account” to retrieve information I want, this is the type of password I used to use. Now that I use password manager software (Lastpass specifically) I choose passwords more randomly and let the manager remember them.
Continue reading Interesting Email Scam I Received
There is no way to verify an email’s contents except through cryptography. Until every email client includes encryption and reliable authentication, we should always doubt an email’s source.
We can increase our confidence in an email a little, though, by tracing its path through the mail system. I use this technique more-or-less daily to look at potential phishing emails. If the final Received header didn’t come from my bank, then I know it’s fake.
Continue reading How to Trace an Email Message
I receive thousands of emails every month. I do a lot of (for me) critical activities online. I never receive legitimate emails demanding a suspicious online action any more.
Except from HR departments.
IT security people know this is a problem. The upper left image comes from the University of Minnesota’s phishing awareness blog. HR people as individuals also seem to know that phishing is a problem. But they still insist on sending suspicious-looking emails that demand personal information. No doubt it saves their department a few dollars.
Full disclosure: as noted at the end of this posting, Minnesota’s HR department has taken several steps to reduce these risks.
Continue reading HR and Phishing
My textbook lists categories of cyber-attacks that focus on an attack’s lasting impact: how does it affect the target’s assets and resources? Since the categories really reflect the attack’s impact on the target, they really represent risks. Here are the categories I use right now:
Denial of service – Pillage – Subversion
Masquerade – Forgery – Disclosure
This is a work in progress as I figure out some conceptual ideas.
Continue reading The Six Types of Cyber-Risks
Quantum computing gives us a way in theory to quickly crack certain types of cryptography. Well-funded startups are working on prototype quantum circuits, as are big guns like Intel, Microsoft, and IBM. Success could render a lot of today’s encryption obsolete. In theory.
Academic and industrial research labs have built basic quantum circuits. If Moore’s Law applies to quantum circuits, they will be the next big thing.
I remain skeptical. Quantum computing seems like perpetual motion machines to me, though I’ve never researched reasons to support my intuition. Researcher Gil Kalai presents an argument based on computational theory and models of noise. He argues that practical computations will lose out to noise effects. I’ll be interested to see more about this.
The big news this week is a protocol flaw in the Wireless Protected Access protocol, version 2 (WPA2). The Ars Technica article covers the details pretty well. This is what every Wi-Fi wireless router on the planet uses these days. The problem does not directly damage your system, but it can uncover data you had intended to encrypt.
The technique can trick the system into reusing a cryptographic key. To keep encrypted data safe we must avoid encrypting the same data twice (here’s an example of how it fails). While crypto system designs usually account for this, the attack on WPA2 tricks the system into reusing the key.
Continue reading The Big Bug in the News: the WPA2 flaw
As I said in an earlier post, no crime is committed if the appropriate official leaks sensitive classified information. This applies to both Secretary Clinton’s email server and President Trump’s unfortunate meeting with Russian diplomats. Both carried the authority to disclose what they disclosed. One question remains: what damage might have ensued from each leak?
I would argue that in both cases the initial lapse of judgement did not explicitly damage the United States. In both cases, however, the subsequent brouhaha may have leaked classified information. I personally doubt that the country will suffer much from either leak, though that is based on my own assessment of national threats (a political opinion).
Continue reading Comparing Leaks: Trump vs. Hillary
I sympathize with developers who throw up their hands and say, “I don’t do security stuff.” No matter what you choose, there’s a trade off that could go wrong. It’s especially troublesome if one deploys a “security website.” I’ve deployed security education websites in many environments over the past 20 years, and I rarely achieve the security level I’d like.
I wanted to watch a security webinar today. But the webinar requires Adobe Flash, in which security researchers seem to uncover 1 or 2 vulnerabilities a month. I discarded Flash when upgrading my OS a couple years ago. It’s ironic that a security webinar might tempt it back onto my machine.
Continue reading Tiptoeing Through Vulnerabilities
Here are a couple of short videos that describe the basic cryptographic mechanisms used in DVDs. These don’t quite fit into my Cryptosmith series, at least, not right now.
They’re short and interesting, so I went ahead and posted them.
The Cryptosmith video series uses animation to explain well-known crypto techniques. This should help more people understand crypto technology. This is particularly important as people rely more and more on mobile and Internet security mechanisms. Aside from protecting online commerce and financial activities, many professionals are realizing that their daily activities require strong protection.
[UPDATE: See the latest post to summarize the video series.]
After publishing three books on cybersecurity and cryptography I’m looking for a different medium for explaining technical concepts. While there are many online tutorial videos, most are narrated slide presentations. I’m trying something else.
Continue reading Cryptosmith Video Series