UK shirt design
This page probably won't be very interesting to you unless you
want to print shirts yourself, or are curious to print the postscript
files which make up the design.
File formats
These files are links to actual gzipped postscript files, you will
need gzip (GNU zip, available for PCs here GNU
zip), which is basically standard on unix these days. To save
these links to file you will need to tell your browser to save the
next item, with netscape this is hold down the shift key and click on
the URL of the file you want. For those with slow dowload rate, I
have indicated size in brackets after file name. You should save the
files as ending in .gz even if your browser has other ideas, or you
will have to rename them afterwards because gzip insists on them
ending in .gz. Then you type gzip -d file.gz and it will
create file.ps. These files are straight postscript files,
and should print on any standard postscript printer.
Front of shirt
File warning.gz(79k) says:
Warning
This shirt is classified as a munition and
may not be exported from the United
States, or shown to a foreign national
File rsa.gz(36k) says:
RSA
encryption in perl
Machine readable version of program: CODE128 barcode
The blank lines between 'encryption in perl' and 'Machine readable...'
is a gap left for the next file, the perl program in OCRA. You just
get your printer to montage them together.
File perl.gz(5k) says, in an OCRA font:
<![CDATA[
#!/bin/perl -s-- -export-a-crypto-system-sig -RSA-3-lines-PERL
$m=unpack(H.$w,$m."\0"x$w),$_=`echo "16do$w 2+4Oi0$d*-^1[d2%Sa
2/d0<X+d*La1=z\U$n%0]SX$k"[$m*]\EszlXx++p|dc`,s/^.|\W//g,print
pack('H*',$_)while read(STDIN,$m,($w=2*$d-1+length($n)&~1)/2)
]]>
File barcode.gz(104k) is a barcode of the above
program, only it is in inverse video to prepare for being in a white
box on a black shirt (it was a very painful experience inverting it,
involved editing the raw postscript file, and playing with xfig
output). If you're doing a black shirt, and want the barcode in a
white box, use this file, if you're doing a white shirt (they've all
been black so far), you'll need to use the second barcode, below.
File barcode2.gz(104k) is the same barcode
again, without the colour inversion.
As you will note the barcode has 8 lines rather than 4 as in the
program, this is to try to improve the chances of the shirt barcode
being readable, Don Henson who was the first to ship shirts in the US,
had someone try to scan the finished shirt with a barcode scanner: it
failed! That was the motivation for the big clunky barcode files
above. It might be ugly, but I have had confirmation from people who
have bought shirts that it scans.
Because it is eight lines, when (and if) it scans it will come out
like this:
<![CDATA[
#!/bin/perl -s $m=unpack(
H.$w,$m."\0"x$w),$_=`echo
"16do$w 2+4Oi0$d*-^1[d2%
Sa2/d0<X+d*La1=z\U$n%0]SX
$k"[$m*]\EszlXx++p|dc`,s/
^.|\W//g,printpack('H*',$
_)while read(STDIN,$m,($w
=2*$d-1+length($n)&~1)/2)
]]>
You will need to combine it all onto one long line, and add a line
break between the '#!/bin/perl -s' and the '$m=unpack(H.$w ...' Then
it should be functionally the same as the text on the shirt (the
-export-a-crypto-system-sig -RSA-3-lines-PERL is just a comment). See
this page for more detailed info on
how to
use perl-rsa.
Back of shirt
File ammend.gz(67k) is the US constitutional
ammendments (it has the VOID stamp graphic below superimposed in red
on top of, and partly obscuring it).
File void.gz(79k) the void stamp, basically just a
big stamp with the word void in large stencil font diagonally in a box
to resemble a big ammo crate like effect. Printed in red with puff
effect (means raised effect, your printer should know what it means).
File itar.gz(79k) relevant sections from ITAR
regulations, all in nice stencil font. It says (only it's all caps on
the shirt because the stencil font has no lower case letters):
International Traffic in Arms Regulations
ITAR section 120.17 (4), verbatim:
Disclosing (including oral or visual disclosure) or transferring
technical data to a foreign person, whether in the United States or
abroad
ITAR section 121.1 (Category XIII)
lists tanks, heavy artillery, various other implements of mass
destruction, and cryptographic software as export
controlled defense articles
22 U.S.C 2778, 2779 says for violting ITAR
FINE of $1,000,000 and/or 10 years imprisonment per count
File france.gz(133k) is the French crypto
regulations, plus perl RSA muntions T homepage URL. You'll want to
edit the country, printer, and maybe URL if you have one. (I have
gotten quite adept at editing postscript files, if it's a small change
only you need). This says:
So, the technical data is THIS shirt, and that could be YOU
Crypto is illegal in France - penalty up to 500,000 FF
and/or 3months jail
Loi 90-1170 du 29/12/90 (art 28)
Do you have authorisation from SCSSI to wear this shirt?
Printed by Adam Back: http://www.obscura.com/~shirt/
Made in the United Kingdom
Credits
The UK design was contributed to by a number of people: Josh Osborne
for the idea of printing a muntions T-shirt from the perl .sig, the
design was by TJ Hardin, who did the font and layout work, Mark
Shoulson for helping me with TeX Metafont questions to get the OCRA
font for the program text, Josh Osborne for providing software to make
barcodes, and for some of the wording from the 1st muntions T-shirt
which he got Joel Furr to print, Mike Norwick (EFF) for pointing out
an error in the ITAR reference no, in the nick of time, and SaltRock
surf gear for printing the shirts. Also there were many people who
offered comments on earlier designs.
Comments, html bugs to me
(Adam Back) at
<adam@cypherspace.org>