home *** CD-ROM | disk | FTP | other *** search
- Date: Thu, 24 Jun 93 12:49:49 -0700
- From: Phil Karn <karn@UNIX.KA9Q.AMPR.ORG>
- Subject: File 4--Re: Full Disclosure TRIGGERFISH Hassle (CuD 5.46)
-
- In CU Digest 5.46:
- |> Harris Law Enforcement Products
- |>
- |> TRIGGERFISH has a number of cellular phone based applications:
- |> determining a suspects phone number, dialed number recorder, and
- |> wiretapping. According to Harris, 'for the first time, law
- |> enforcement is not at a disadvantage in tracking the high-tech
- |> criminal." Additionally, the unit 'collects and integrates all
- |> relevant data, including voice, directly from the ether."
-
- |> Reprinted from Full Disclosure, Box 903, Libertyville, Illinois 60048
-
- I find the phrase "directly from the ether" *most* illuminating given
- a rather heated exchange I had with Mr. Jim Kallstrom of the FBI at
- the recent CPSR Cryptography Conference in Washington DC earlier this
- month.
-
- Kallstrom is the FBI's chief public advocate for their "Digital
- Telephony Initiative". Among other things, they want the ability to
- intercept suspects' cellular telephone calls at the MTSO (switch).
- Only with a valid warrant, naturally.
-
- At the meeting, I made the following comments. I had seen the
- standards-setting process for the new digital cellular telephone
- systems from the inside as they related to security and privacy. And I
- was wondering why the government (specifically NSA, through its export
- control reviews) was so strongly opposed to meaningful air link
- encryption, even if the encryption were to stop at the switch as it
- would have to in order to be compatible with existing telephones on
- the land side of a cellular call. Such encryption would secure the air
- link, the most easily intercepted portion of a cellular telephone
- call, while leaving the conversation in the clear at the MTSO where it
- could be tapped, if necessary.
-
- In a private conversation, one of the senior members of the committee
- who didn't want his name mentioned told me why. "It's very simple", he
- said. "Anybody can intercept the radio link. It's easy. But tapping a
- call at the switch requires the cooperation of the telephone company,
- and they generally require warrants. And law enforcement says that
- sometimes, warrants are, well, just too damn inconvenient."
-
- This really set Kallstrom off. He attacked my unwillingness to name my
- source. I challenged him, unsuccessfully, to back up *his* shrill
- claims for the absolute necessity of Digital Telephony with anything
- more than handwaving. In a one-on-one conversation during a break, he
- insisted to me that the FBI was never interested in intercepting the
- air link portion of cellular calls - "too difficult, too
- labor-intensive", he said. They only wanted the capability to tap in
- at the switch, and he couldn't care less if the air link were securely
- encrypted (though he still wanted the keys to be escrowed for some
- reason...hmmm...)
-
- Perhaps it was a desperate attempt to maintain this "we're not
- interested in the air link" fiction that triggered Harris's silly
- overreaction to the public mention of TRIGGERFISH.
-
- Phil
-
- Downloaded From P-80 International Information Systems 304-744-2253
-