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And then some script kiddie from 4chan with a GPU outs all the plaintexts, and/or sets up a Twitter bot to automate it. Be very, very careful with ad-hoc security "protocols" like this. Especially when your livelihood may be at stake.https://twitter.com/Dharlette/status/944183293653733376 …
This is like that Catalonia hashed database for voter identification that ended up outing national ID / birthday / zipcode associations. Hashes aren't magical pixie dust. If the search space is bruteforceable, they amount to the illusion of security.
If you *must* do this (and understand the risks), either use full legal names to maximize entropy and a very strong salted hash, like say bcrypt/scrypt tuned to take 5 seconds per hash on a CPU, or similar...
... or use a very *weak* hash, like the 6-digit prefix of the SHA1 (24 bits), to guarantee collisions and thus make it a probabilistic filter and not something you could brute force usefully.
I fail to see what you're getting at here. If the name can be brute forced from a wordlist of names, you might as well post the plaintext. It doesn't matter what your intention is. Yes, bcrypt helps, though it doesn't guarantee security either.
No, because if you can use a Rainbow Table, then the *very specific threat* that using a hash instead of a plaintext name is trying to solve gets shifted onto the person who uses a Rainbow table to collate a list of abusers.
What is that "very specific threat", exactly?
Waiting for someone to make a cryptocurrency based on cracking hashes of names... Is there an ICO yet?
can do it with an ethereum contract no?
Could work with Argon2, but there are few enough names that it wouldn't take that long to work out the big players.
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