4 ms·

Thank you for this writeup, this was before my time on the internet. > People remixed each other's work until the core DeCSS algorithm was only a single line o

Thank you for this writeup, this was before my time on the internet. > People remixed each other's work until the core DeCSS algorithm was only a single line of code. Gzipped, there was nearly nothing left What was the actual number? Can you post it here?

peterburkimsher 9y ago
k·256^211 + 99
- iforgotpassword 9y ago
  That's it I'm calling the cops!
- kleiba 9y ago
  ...where k is the decimal representation of the original compressed DeCSS file. (just for context) Note the implication: the prime basically is the original program represented as a binary number, then shifted 211 bytes (i.e., 00000000 appended 211 times). Then 99 is added to that number. Note that 99 is representable by a single byte. Consequenly, if you take that prime number and chop off the last 211 bytes, you end up with the original program.
snarfy 9y ago
I recall a version that was an ascii string that you could save as a file with a .zip extension and it would unzip into the source.
- DanBC 9y ago
  I think that's in the steganography wing here: https://www.cs.cmu.edu/~dst/DeCSS/Gallery/Stego/index.html https://www.cs.cmu.edu/~dst/DeCSS/Gallery/Stego/index.html > This gif file contributed by Robert de Bath, contains a surprise inside. Mr. Bath writes: "There are two tiny facts about GIF files and ZIP files you might like to know about: GIF files have their length defined at the start of the file; any bytes after are ignored. ZIP files have a table at the end; anything at the start of the file is ignored. The result is that a file can be both a GIF and a ZIP, just change the extension." I also like the gallery, which contains a variety of code-golf like discussions of the edge cases of US 1st ammendment protections. http://www.cs.cmu.edu/~dst/DeCSS/Gallery/ http://www.cs.cmu.edu/~dst/DeCSS/Gallery/
- roman_savchuk 9y ago
  And I remember someone was selling t-shirts with that string!
  - rconti 9y ago
    I had the RSA "this shirt is a munition" t-shirt that was technically illegal to take outside of the United States due to export controls. Though, it wasn't 1/100th as ugly as this block of graffiti spam. http://www.cypherspace.org/adam/uk-shirt.html http://www.cypherspace.org/adam/uk-shirt.html
deleted 9y ago
[deleted]
wodenokoto 9y ago
Check out the gallery of css http://www.cs.cmu.edu/~dst/DeCSS/Gallery/ http://www.cs.cmu.edu/~dst/DeCSS/Gallery/

peterburkimsher 9y ago

k·256^211 + 99

iforgotpassword 9y ago
That's it I'm calling the cops!
kleiba 9y ago
...where k is the decimal representation of the original compressed DeCSS file. (just for context) Note the implication: the prime basically is the original program represented as a binary number, then shifted 211 bytes (i.e., 00000000 appended 211 times). Then 99 is added to that number. Note that 99 is representable by a single byte. Consequenly, if you take that prime number and chop off the last 211 bytes, you end up with the original program.

snarfy 9y ago

I recall a version that was an ascii string that you could save as a file with a .zip extension and it would unzip into the source.

DanBC 9y ago
I think that's in the steganography wing here: https://www.cs.cmu.edu/~dst/DeCSS/Gallery/Stego/index.html https://www.cs.cmu.edu/~dst/DeCSS/Gallery/Stego/index.html > This gif file contributed by Robert de Bath, contains a surprise inside. Mr. Bath writes: "There are two tiny facts about GIF files and ZIP files you might like to know about: GIF files have their length defined at the start of the file; any bytes after are ignored. ZIP files have a table at the end; anything at the start of the file is ignored. The result is that a file can be both a GIF and a ZIP, just change the extension." I also like the gallery, which contains a variety of code-golf like discussions of the edge cases of US 1st ammendment protections. http://www.cs.cmu.edu/~dst/DeCSS/Gallery/ http://www.cs.cmu.edu/~dst/DeCSS/Gallery/
roman_savchuk 9y ago
And I remember someone was selling t-shirts with that string!
- rconti 9y ago
  I had the RSA "this shirt is a munition" t-shirt that was technically illegal to take outside of the United States due to export controls. Though, it wasn't 1/100th as ugly as this block of graffiti spam. http://www.cypherspace.org/adam/uk-shirt.html http://www.cypherspace.org/adam/uk-shirt.html

deleted 9y ago

[deleted]

wodenokoto 9y ago

Check out the gallery of css http://www.cs.cmu.edu/~dst/DeCSS/Gallery/ http://www.cs.cmu.edu/~dst/DeCSS/Gallery/