Administrace komentářů

pato@debian:~$ mkdir test

pato@debian:~$ touch test.file

pato@debian:~$ for i in {1..10}; do gzip -c test.file | md5sum >> hash.file; sleep 1; done

pato@debian:~$ cat hash.file 

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

fd4cb01520ca9580b5543c98a2869994  -

2. Hash je vzdy rozny, umiestnenie rovnake, ale atime a mtime suboru sa menil.

pato@debian:~$ for i in {1..10}; do touch test.file; gzip -c test.file | md5sum >> hash.file; sleep 1; done

pato@debian:~$ tail -n 10 hash.file 

7d91fea8f0aac23996983a64f407bc57  -

c5427b6fa4c62451dd9910abfb8e8d51  -

5b5ee4a68aed9dca24a66c9f558ae5ee  -

0892f2d24970bdafc5c1b7130d6cabb1  -

f21c00c676bf10f0c3d2ea44723694ae  -

61b811028440fab6173eb1ede0efa0a8  -

ea82720904dbce1112684bebde62f134  -

cc7b9da59031057dde49205f48a71529  -

76a047c55682bcf219263b4604c1e79e  -

b82b41e9a935383e2154300df58c6a5b  -

3.Hash je vzdy rovnaky pocas tohto testu, ale iny ako v bode 1, umiestnenie sa menilo, atime a mtime je vsak rovnaky.

pato@debian:~$ cp test.file test

pato@debian:~$ for i in {1..10}; do gzip -c test/test.file | md5sum >> hash.file; sleep 1; done

pato@debian:~$ tail -n 10 hash.file 

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

12e6a9ee3a4b61fc12d7826c091eea65  -

Takze z toho plynie, ze tak zmena atime ci mtime ako aj umiestnenie maju vplyv na hodnotu hashu. Co teda len potvrdzuje predchadzajuce tvrdenia.

p.s.: Ako sa prida komentar k archivu som ani v manualovych strankach nenasiel, ale pokial sa to ulozi do archivu, tak hash by bol znova rozny.