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orthonormal comments on Harry Potter and the Methods of Rationality discussion thread - Less Wrong
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For "Harry Potter and the Methods of Rationality", I'd like to make predictions that can be eventually verified publicly in time, but won't tempt the author to change things to prevent it from coming true (as is the usual way of serial writers on the Internet). I'm therefore encrypting my prediction with the md5 hash function, so that afterwards it can be verified. (One difficulty is that I have the power to edit this comment; is there a way to make it obvious if I've done so, or store it in a less editable space?) Anyway, here goes:
July 16 (after Chapter 31): 28f9e3b2165344763c35514b473cb347
July 25 (after Chapter 32, prediction for Chapter 33):
SHA-1: f5721b3c6010973ee195dc160d0679477401a3df
Copying here to verify lack of editing in future.
Translation:
End of 32 only listed 3 options for Zabini. The fourth creates a 3-way tie. Zabini shoots himself as traitor.
Try echo -n.
Ah, you're right. I forgot
echoappends a newline by default.When the -n flag is added to the echo command (as suggested by ata) the hash matches.
So, unless orthonormal has exploited a security vulnerability on the Less Wrong server, orthonormal has expended a costly number of computing cycles to defeat the purpose of the hash function, I misunderstand the cryptographic guarantees provided by the hash function, or something equally unlikely, orthonormal really did write the following back on 25 July:
Erm, yeah. I thought we all understood the hash scheme.