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Cryptfs - jeg løj



I aftes fandt jeg på en ene løgnehistorie efter den anden.

Gzipfs gemmer ikke filerne som gzippede filer. Den komprimerer dem ganske
vist (med deflate - som også bruges i gzip), men resultatet er ikke valide
gzip-filer. Uden at have læst koden, så gætter jeg på, at han flusher
ordbogen en gang imellem, så han ikke er nødt til at dekomprimmere hele
filen for at kunne dekomprimmere den sidste blok. I hvert fald komprimerer
den lidt dårligere end gzip -1.

En mount af gzipfs ser sådan ud:

  insmod gzipfs.o
  mount -t gzipfs -odir=zipped zipped/ unzipped/

For cryptfs ser mount sådan ud:

  insmod cryptfs.o
  mount -t cryptfs -odir=/tmp/encrypted /tmp/encrypted/ /tmp/decrypted/
  echo min_hemmelige_kode | fist_setkey /tmp/decrypted/

Cryptfs og FiST bor her:

http://www.cs.columbia.edu/~ezk/research/fist/
http://www.cs.columbia.edu/~ezk/research/cryptfs/


/Ole



 
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