Let’s hope that doesn’t need to be done, we’re having enough trouble as it is. He was probably talking about the ARG he mentioned as 0418 in this thread, Torment by greengecko. Sadly, if he took inspiration from it, as it seems since that ARG also gave the coordinates of the kryptos statue, we will never know, it was deleted in 2011 because some players hacked the email account of the creator. The only thing I could found was a puzzle trail in the unfiction forums where stormseeker had made some comments.
If he used a block cipher, he probably used OpenSSL (maybe I’m wrong, but I think is by far the most used encryption software, thats why the heartbleed bug that everyone talks about is such a problem). I’ve been thinking about using a salt, since our previous attemps to decode it did not work, and if he wanted to change the size of the ciphertext so it looked like the block size was 64 bits, this is a possibility. OpenSSL keeps the salt padded to the ciphertext in HEX like this
Salted__[Here_be_salt][Here_be_ciphertext]
If he wanted to obfuscate the block size, since the salt by default is 8 bytes long in OpenSSL, and "Salted__ "is also 8 bytes long, by deleting “Salted__”, the ciphertext of a 128 bits block size cipher, would go from being a multiple of 128bits, to multiple of 64bits. Thus, by adding Salted__ at the start of the HalosCode, block ciphers with a block size of 128 bits, like AES, could be used with non-stream modes, like cbc and ecb, to decrypt the code.
Edit: Apparently, there is another Black Mesa arg:
https://trevorbrennan.com/dev/bmrf/about.php
If you look at the source code, it is stated that it is based on half-life and portal, by Valve. You will also find in a comment part 1 of 4 of a message, It decodes to “Simulation data for spe” also, you can see the exact same ascii art lambda than in the source code of bmrf.us. Also(too many also’s),the start of the source code is equal to the one in terminal.bmrf.us.
So… bmrf.us is not even a redherring, somebody else is making webpages about another Black Mesa ARG.
https://trevorbrennan.com/bmiarg.html
Still, why bmrf.us has a DALsys login? Wasn’t that supossed to be the signature of one of the BM developers?
From the wiki, added by flavrans9:
“DALsys/DALsystems is the claimed signature from a modeler/texture artist on the BM development team, Brian Dale (a.k.a. bkdale86), as he revealed in a thread he made in the “Developer Updates” section on the forums in early March, 2014.”
So… the question now is… is the Black Mesa Incident ARG related to the Pizza Code Mistery ARG?