Entries Tagged "doghouse"

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"New Attack" Against Encrypted Images

In a blatant attempt to get some PR:

In a new paper, Bernd Roellgen of Munich-based encryption outfit PMC Ciphers, explains how it is possible to compare an encrypted backup image file made with almost any commercial encryption program or algorithm to an original that has subsequently changed so that small but telling quantities of data ‘leaks’.

Here’s the paper. Turns out that if you use a block cipher in Electronic Codebook Mode, identical plaintexts encrypt to identical ciphertexts.

Yeah, we already knew that.

And -1 point for a security company requiring the use of Javascript, and not failing gracefully for a browser that doesn’t have it enabled.

And — ahem — what is it with that photograph in the paper? Couldn’t the researchers have found something a little less adolescent?

For the record, I doghoused PMC Ciphers back in 2003:

PMC Ciphers. The theory description is so filled with pseudo-cryptography that it’s funny to read. Hypotheses are presented as conclusions. Current research is misstated or ignored. The first link is a technical paper with four references, three of them written before 1975. Who needs thirty years of cryptographic research when you have polymorphic cipher theory?

EDITED TO ADD (10/9): I didn’t realize it, but last year PMC Ciphers responded to my doghousing them. Funny stuff.

EDITED TO ADD (10/10): Three new commenters using dialups at the same German ISP have showed up here to defend the paper. What are the odds?

Posted on October 9, 2008 at 6:44 AMView Comments

The Doghouse: Tornado Plus Encrypted USB Drive

Don’t buy this:

My first discussion was with a sales guy. I asked about the encryption method. He didn’t know. I asked about how the key was protected. Again, no idea. I began to suspect that this was not the person I needed to speak with, and I asked for a “technical” person. After a short wait, another sales guy got on the phone. He knew a little more. For example, the encryption method is to XOR the key with the data. Those of you in the security profession know my reaction to this news. For those of you still coming up to speed, XORing a key with data to encrypt sensitive information is bad. Very bad.

EDITED TO ADD (9/13): In the comment thread, there’s a lot of talk about one-time pads. This is something I wrote on the topic in 2002:

So, let me summarize. One-time pads are useless for all but very specialized applications, primarily historical and non-computer. And almost any system that uses a one-time pad is insecure. It will claim to use a one-time pad, but actually use a two-time pad (oops). Or it will claim to use a one-time pad, but actually use a stream cipher. Or it will use a one-time pad, but won’t deal with message re-synchronization and re-transmission attacks. Or it will ignore message authentication, and be susceptible to bit-flipping attacks and the like. Or it will fall prey to keystream reuse attacks. Etc., etc., etc.

Posted on September 12, 2008 at 12:05 PMView Comments

The Doghouse: Passwordsafe.com

This isn’t my Password Safe. This is PasswordSafe.com. Password Safe is an open-source application that lives on your computer and encrypts your passwords. PasswordSafe.com lets you store your passwords on their server. They promise not to look at them.

Can I trust PasswordSafe?

As we mentioned, pretty much every function is automated, no-one here ever sees your information as it’s all taken care of by the programs and encrypted into the database. Again we’ll remind you, we do not recommend you store sensitive information at PasswordSafe. In house, we’ve used this service for many sites, banner programs, affiliate programs, free email services and much more.

Posted on May 5, 2008 at 6:37 AMView Comments

Perpetual Doghouse: Meganet

I first wrote about Meganet in 1999, in a larger article on cryptographic snake-oil, and formally put them in the doghouse in 2003:

They build an alternate reality where every cryptographic algorithm has been broken, and the only thing left is their own system. “The weakening of public crypto systems commenced in 1997. First it was the 40-bit key, a few months later the 48-bit key, followed by the 56-bit key, and later the 512 bit has been broken…” What are they talking about? Would you trust a cryptographer who didn’t know the difference between symmetric and public-key cryptography? “Our technology… is the only unbreakable encryption commercially available.” The company’s founder quoted in a news article: “All other encryption methods have been compromised in the last five to six years.” Maybe in their alternate reality, but not in the one we live in.

Their solution is to not encrypt data at all. “We believe there is one very simple rule in encryption: if someone can encrypt data, someone else will be able to decrypt it. The idea behind VME is that the data is not being encrypted nor transferred. And if it’s not encrypted and not transferred, there is nothing to break. And if there’s nothing to break, it’s unbreakable.” Ha ha; that’s a joke. They really do encrypt data, but they call it something else.

Read the whole thing; it’s pretty funny.

They’re still around, and they’re still touting their snake-oil “virtual matrix encryption.” (The patent is finally public, and if someone can reverse-engineer the combination of patentese and gobbledygook into an algorithm, we can finally see how actually awful it really is.) The tech on their website is better than it was in 2003, but it’s still pretty hokey.

Back in 2005, they got their product FIPS 140-1 certified (#505 on this page). The certification was for their AES implementation, but they’re sneakily implying that VME was certified. From their website: “The Strength of a Megabit Encryption (VME). The Assurance of a 256 Bit Standard (AES). Both Technologies Combined in One Certified Module! FIPS 140-2 CERTIFICATE # 505.”

Just goes to show that with a bit of sleight-of-hand you can get anything FIPS 140 certified.

Posted on June 14, 2007 at 1:05 PMView Comments

The Doghouse: Onboard Threat Detection System

It’s almost too absurd to even write about seriously — this plan to spot terrorists in airplane seats:

Cameras fitted to seat-backs will record every twitch, blink, facial expression or suspicious movement before sending the data to onboard software which will check it against individual passenger profiles.


They say that rapid eye movements, blinking excessively, licking lips or ways of stroking hair or ears are classic symptoms of somebody trying to conceal something.

A separate microphone will hear and record even whispered remarks. Islamic suicide bombers are known to whisper texts from the Koran in the moments before they explode bombs.

The software being developed by the scientists will be so sophisticated that it will be able to take account of nervous flyers or people with a natural twitch, helping to ensure there are no false alarms.

The only thing I can think of is that some company press release got turned into real news without a whole lot of thinking.

Posted on February 16, 2007 at 6:55 AMView Comments

The Doghouse: SecureRF


Claims to offer the first feasible security for RFIDs. Conventional public key cryptography (such as RSA) is far too computationally intensive for an RFID. SecureRF provides a similar technology at far lower footprint by harnessing a relatively obscure area of mathematics: infinite group theory, which comes (of all places) from knot theory, a branch of topology.

Their website claims to have “white papers” on the theory, but you have to give them your personal information to get it. Of course, they reference no actual published cryptography papers. “New mathematics” is my Snake-Oil Warning Sign #2 — and I strongly suspect their documentation displays several other of the warning signs, too. I’d stay away from this one.

Posted on October 9, 2006 at 7:47 AMView Comments

Sidebar photo of Bruce Schneier by Joe MacInnis.