tcpdump -E question

[alex medvedev <alexm () pycckue org>]

hallo,

how would one go about using -E option of tcpdump?
what is the right syntax if i have 3des and my key is "my secret key"?
[note white spaces]

reading the man page i got an impression that i need syntax similar to:

# tcpdump -E 3des-cbc:"ascii text of my key"

i unsuccessfully tried variations of

-E 3des:"ascii text of my key"
-E "3des:ascii text of my key"
...

looking at print-esp.c though, i noticed this in the comments:

        decode the form:    SPINUM@IP <tab> ALGONAME:0xsecret

so, it is a HEX secret (?)
what if i only know "human readable" ascii secret, can i produce the HEX
out of it easily?
and what is SPINUM@IP <tab> referring to?

thanks,

-alexm





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