On Sun, 26 Aug 2018 01:24:05 -0400, zMan wrote:
>Heh. I've never believed that story, simply because I disbelieve that 1403s
>were consistent enough. But maybe they were also SLOW enough that the
>jitter didn't matter, I dunno.
>
It's marginally plausible. The precision lay not in the 1403 but in the
crystal(?)
clock of the intimately coupled 1401.
https://en.wikipedia.org/wiki/IBM_1403#Technology
Every 11 μs memory cycle exactly one slug on the print train passed exactly
one hammer. The control unit fetched the character from print buffer
corresponding
to that column and compared it (shift register?) to the character on the type
slug.
if they matched the hammer solenoid fired. That was the only character and only
column that could be active during that 11 μs. The first step in decoding is
to determine
the phase. It's just a substitution cipher. The story may be too amusing to
be true.
>On Sat, Aug 25, 2018 at 6:08 PM Paul Gilmartin wrote:
>
>> https://www.bleepingcomputer.com/news/security/new-attack-recovers-rsa-encryption-keys-from-em-waves-within-seconds/
>> >
>> Somewhat reminiscent of the decades-old story of a hacker who parked a van
>> outside a sensitive site and replicated their printouts by deciphering the
>> EMI
>> from 1403 print hammer solenoids.
-- gil
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