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- Newsgroups: sci.crypt
- Path: sparky!uunet!haven.umd.edu!darwin.sura.net!zaphod.mps.ohio-state.edu!malgudi.oar.net!chemabs!jac54
- From: jac54@cas.org ()
- Subject: Re: DES (Was: Re: 800MHz
- Message-ID: <1993Jan11.172502.3651@cas.org>
- Sender: usenet@cas.org
- Organization: Chemical Abstracts Service, Columbus, Ohio
- References: <1993Jan9.163011.23230@csi.uottawa.ca> <1993Jan10.050811.3740@ils.nwu.edu> <1993Jan10.060013.4644@csi.uottawa.ca>
- Date: Mon, 11 Jan 1993 17:25:02 GMT
- Lines: 26
-
- In article <1993Jan10.060013.4644@csi.uottawa.ca> cbbrowne@csi.uottawa.ca (Christopher Browne) writes:
- >
- >If it "only" costs $56, then they must have some CHEAP ways to break
- >DES, unless they're COMPLETELY ignoring the cost of computer
- >resources. In short, for $56 a pop, they can't be using brute force.
- >Maybe they can use differential analysis. Maybe they can use
- >something analogous to D.A. But for $56 per pop, they're either
- >lying, or they have SOME "silver bullet."
-
- I have a modest familiarity with government accounting,
- being married to a government accountant, and it does
- work in mysterious ways but let me comment on this anyway.
-
- If the machine(s) had been bought for a specific purpose,
- e.g. reading DES, then the cost of the machine would have
- to be included in the cost of the decrypt. If the machine
- was already present and being used to heat the parking tower
- in winter, then its purchase price need not be include in the
- cost of the decryption. What would have to be included would
- be the cost of developing the decryption procedure, writing the
- software, mounting and debugging it.
-
- Then, of course, you can amortize these costs over the prime factors
- of the cost of a B-2 bomber...
-
- Alec Chambers
-