Re: z340crack : A Tool For Brute-Force Cracking The Zodiac Serial Killer's Z340 Cipher.

in reply to z340crack : A Tool For Brute-Force Cracking The Zodiac Serial Killer's Z340 Cipher.

How long is this supposed to take? On my box it has taken almost 12 calendar days and just about as much CPU time.

me@mybox:~/sandbox
$ date ; ps -ef | grep zod
Tue Jul 19 12:36:08 EDT 2011
me        9267     1  0 Jul07 ?        00:00:00 time ./zod.pl
me        9268  9267 99 Jul07 ?        11-19:49:32 /usr/bin/perl ./zod
+.pl
me       12255 12193  0 12:36 pts/5    00:00:00 grep zod
me@mybox:~/sandbox
$ ps -o etime -p 9268
    ELAPSED
11-21:45:38
[download]

My box is not wimpy from what I can tell about Intel hardware these days.

me@mybox:~/sandbox
$ head -n 14 /proc/cpuinfo
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           E7320  @ 2.13GHz
stepping        : 8
cpu MHz         : 2133.050
cache size      : 2048 KB
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge
+ mca cmov pat pse36 clflush dts acpi mmx fxsr sse sse2 ss syscall lm 
+pni cx16 lahf_lm
bogomips        : 4374.81
[download]

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Re^2: z340crack : A Tool For Brute-Force Cracking The Zodiac Serial Killer's Z340 Cipher. by jffry (Hermit) on Jul 28, 2011 at 16:13 UTC
Still going strong at 20+ days `me@mybox:~/sandbox $ ps -o etime -p 9268 ELAPSED 20-21:13:15` [download]	[reply] [d/l]
Re^2: z340crack : A Tool For Brute-Force Cracking The Zodiac Serial Killer's Z340 Cipher. by jffry (Hermit) on Aug 22, 2011 at 17:15 UTC
I now realize the joke is on me. There is no place in the `while ($z>=0)` loop that `$z` will ever get set to below 0. No wonder I've been running this now for 45 days without end!	[reply]
Re^3: z340crack : A Tool For Brute-Force Cracking The Zodiac Serial Killer's Z340 Cipher. by bpoag (Monk) on Sep 20, 2012 at 17:36 UTC
This script will run forever, producing output and dumping a key when 3 or more "signal words" are found in the noise. Seeing upwards of 3 would yeild a key that would be close enough to a solution that the remainder could be deciphered by human eyes. It's a comprimise between the need for building a very fast engine, and the need to have a strict dictionary check of every possible word. Given the enormous keyspace we're dealing with, it's mathematically unlikely to yeild a full solution in our lifetime. This tool attempts to render partial solutions which warrant human appraisal.	[reply]

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