Category Archives: Cryptography

11th Circuit Rules that Full Immunity Is Required for Compelled Decryption

The 11th Circuit just decided In re Grand Jury Subpoena Duces Tecum March 25, 2011, USA v. John Doe.

Doe was ordered to decrypt his hard drive, and given limited immunity (use immunity) regarding the act of production of the unencrypted contents. He refused, claiming that the immunity was insufficient, and also that he was not in fact able to decrypt the hard drives.

We turn now to the merits of Doe’s appeal. In compelling Doe to produce the unencrypted contents of the hard drives and then in holding him in contempt for failing to do so, the district court concluded that the Government’s use of the unencrypted contents in a prosecution against Doe would not constitute the derivative use of compelled testimony protected by the Fifth Amendment privilege against self-incrimination. This is so, the court thought,because Doe’s decryption and production of the hard drives would not constitute “testimony.” And although that was the Government’s view as well, the Government nonetheless requested act-of-production immunity.13 The district court granted this request.

For the reasons that follow, we hold that Doe’s decryption and production of the hard drives’ contents would trigger Fifth Amendment protection because it would be testimonial, and that such protection would extend to the Government’s use of the drives’ contents. The district court therefore erred in two respects. First, it erred in concluding that Doe’s act of decryption and production would not constitute testimony. Second, in granting Doe immunity, it erred in limiting his immunity, under 18 U.S.C. §§ 6002 and 6003, to the Government’s use of his act of decryption and production, but allowing the Government derivative use of the evidence such act disclosed.

It’s a well-argued opinion and could be influential.

Posted in Cryptography, Law: Criminal Law, Law: Internet Law | 1 Comment

Bitcoin & Gresham’s Law & Botnets

Philipp Güring and Ian Grigg have e-published Bitcoin & Gresham’s Law – the economic inevitability of Collapse (PDF):

Abstract. The Bitcoin economy exhibits remarkable and predictable stability on the supply side based on the power costs of mining. However, that stability is challenged if cost-curve assumption is not solely expressed by the fair cost of power. As there is at least one major player, the botnets, that can operate at a power-cost-curve of zero, the result is a breach of Gresham’s Law: stolen electricity will drive out honest mining. This has unfortunate effects for the stability of the Bitcoin economy, and the result is inevitable collapse.

via Financial Cryptography.

Previously: Checking In With Bitcoin (10/25/11).

Posted in Cryptography, Econ & Money | 1 Comment

Here We Go

Inevitably, here comes the test case:

A U.S. federal judge has ordered a defendent to decrypt her laptop.

Schneier on Security: Federal Judge Orders Defendant to Decrypt Laptop

Posted in Cryptography, Law: Criminal Law | Leave a comment

Those Were The Days

Internet Code Ring! (Interview with Phil Zimmermann, circa 1993).

Posted in Cryptography | Leave a comment

The Fixer (of Broken Security)

Nice profile of Christopher Soghoian in WIRED, entitled “The Pest Who Shames Companies Into Fixing Security Flaws”.

I’ve run into Chris at a few conferences, and read a good bit of his stuff, and I think he’s every bit as good as this profile makes him sound.

Posted in Cryptography, Law: Privacy | Leave a comment

Good News for Bitcoin

It seems the bad guys who infect Macs think it’s worth the trouble to plant Trojans to mine Bitcoins. They’re pretty smart, so I guess this counts as one vote of confidence.

(Thanks to WG for the tip, although probably she won’t approve of the spin.)

Posted in Cryptography, Internet | Leave a comment

Checking in With Bitcoin

It doesn’t look real pretty. See Forbes, The End of Bitcoin Part II. (Although, having a ‘part II’ to your ending suggests you are not going totally quietly.)

I was pretty negative about Bitcoin right from the start, and I make no apologies for that.

Posted in Cryptography, Econ & Money | 5 Comments