ARCHIVE: FBI software cracks encryption wall – ‘Magic Lantern’ part of new Enhanced Carnivore project

FBI has already stolen keys
If Magic Lantern is in fact used to steal encryption keys, it would not be the first time the FBI has employed such a tactic. Just last month, in an affidavit filed by Deputy Assistant Director Randall Murch in U.S. District Court, the bureau admitted using keylogging software to steal encryption keys in a recent high-profile mob case. Nicodemo Scarfo was arrested last year for loan sharking and running a gambling racket. During their investigation, Murch wrote in his affidavit, FBI agents broke into Scarfo’s New Jersey office and installed encryption-key-stealing software on the suspect’s machine. The key was later used to decrypt critical evidence in the case.

Magic Lantern would take the method used in Scarfo one step further, allowing agents to “break in” to a suspect’s office and install keylogging software remotely. But in both cases, the software works the same way.

It watches for a suspect to start a popular encryption program called Pretty Good Privacy. It then logs the passphrase used to start the program, essentially given agents access to keys needed to decrypt files.

Encryption keys are unbreakable by brute force, but the keys themselves are only protected by the passphrase used to start the Pretty Good Privacy program, similar to a password used to log on to a network. If agents can obtain that passphrase while typed into a computer by its owner, they can obtain the suspect’s encryption key — similar to obtaining a key to a lock box which contains a piece of paper that includes the combination for a safe.

Breaking new ground
David Sobel, attorney for the Electronic Privacy Information Center and outspoken critic of Carnivore, did not outright reject the notion of a Magic-Lantern-style project, but raised several cautions.

“This is breaking new ground for law enforcement, to be planting viruses on target computers,” Sobel said. “It raises a new set of issues that neither Congress nor the courts have ever dealt with.”

Stealing encryption keys could be touchy ground for federal investigators, who have always fretted openly about encryption’s ability to help criminals and terrorists hide their work. During the Clinton administration, the FBI found itself on the losing side of a lengthy public debate about the federal government’s ability to circumvent encryption tools. The most recently rejected involved so-called key escrow — all encryption keys would have been stored by the government for emergency recall.

Levels playing field with criminals
A spokesperson for Rep. Dick Armey (R-Texas), said he thought Magic Lantern, as described to him by MSNBC.com, was considerably more palatable than key escrow.

“Citizens should have ability to keep their files and e-mails safe from bureaucratic prying eyes. But this would only be usable against a limited set of people. It’s not as troubling as saying the government should have all the keys,” said the Armey spokesperson. He also said Magic Lantern didn’t raise the same Fourth Amendment concerns regarding search and seizure as Carnivore, because Magic Lantern apparently targets one suspect at a time. Armey, an outspoken Carnivore critic, has complained about the potential for the FBI’s Internet sniffing software to capture too much data as packets fly by headed for a suspect — known in the legal world as an “overly broad” search.

Sobel was concerned that the keylogging software itself could result in overly broad searches, since it would be possible to observe every keystroke entered by a suspect, even if a court order specified a search only for encryption keys. Developers in the Scarfo case went to some trouble to limit the data stored by the keylogging software installed on Scarfo’s computer, shutting the system on and off in an attempt to comply with the court order, according to Murch’s affidavit. But given the confusion surrounding keylogging and encryption, and the mystery surrounding projects like Carnivore, Sobel said he’s worried about the bureau’s use of software that hasn’t been clearly explained to the public or the Congress.

“It is a matter of what protections are in place. At this point, the best documented case is Scarfo, and that raises concerns,” he said. “The federal magistrate who approved the technology in Scarfo had no understanding of what this thing was. I hope there can be meaningful oversight (for Magic Lantern).”