forensics: add already solved challenges

forensics/eavesdrop/file.des3

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+Salted__<EFBFBD><0C><<3C>P<EFBFBD><1F>O<EFBFBD>r<EFBFBD><72>E~cbk<62><6B>ƒ<><C692>p&<26>}<7D><><EFBFBD><EFBFBD><18><>
+F

forensics/eavesdrop/file.txt

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+picoCTF{nc_73115_411_5786acc3}

forensics/eavesdrop/solution.md

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+Taken from `tcp.stream eq 0`
+
+> Hey, how do you decrypt this file again?
+> You're serious?
+> Yeah, I'm serious
+> *sigh* openssl des3 -d -salt -in file.des3 -out file.txt -k supersecretpassword123
+> Ok, great, thanks.
+> Let's use Discord next time, it's more secure.
+> C'mon, no one knows we use this program like this!
+> Whatever.
+> Hey.
+> Yeah?
+> Could you transfer the file to me again?
+> Oh great. Ok, over 9002?
+> Yeah, listening.
+> Sent it
+> Got it.
+> You're unbelievable
+
+`file.des3` taken from `tcp.stream eq 2`, by showing data as `Raw` and saving to file.

forensics/eavesdrop/solve.sh

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+#!/usr/bin/env nix-shell
+#!nix-shell -i bash -p bash openssl
+
+openssl des3 -d -salt -in file.des3 -out file.txt -k supersecretpassword123