A brute-force cracker in Go for the WarpWallet Challenge 2: https://keybase.io/warp/

The WarpWallet Challenge 2 has now expired. The correct passphrase was HY4r0uWn. (private key 5J34oCttqfswmkGnX5NWrU19xkZPNu4a2bRJHW2UdiAU7QpTSsN)

$ go get ./...
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$ go build warpwallet_cracker.go
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$ ./run.sh 
Using address "1MkupVKiCik9iyfnLrJoZLx9RH4rkF3hnA" and salt "a@b.c"
Tried 4 passphrases in 2.269448485s [last passphrase: 2zZM3L1C]

This script has been optimized for speed. On a MacBook Pro this achieves ~1.1 hash/sec/core (with hyperthreading enabled). At this hashrate it is not feasible to enumerate the entire keyspace of 62^8 hashes.

For example: if you run this script for a year on a quad-core Macbook, there is a 1 in ~37M chance of your RNG gifting you 20 BTC.

Ideas for further improvements:

• Explore using SSE2 for faster scrypt
• Use all cores of the CPU
• Build a bloom filter containing past attempts (is a bloom filter lookup faster than a hash attempt?)
• Figure out a way to share the bloom filter with other crackers
• Deterministic key generation for better search space partitioning (instead of seeding rand with a unix timestamp)

Build:

go build warpwallet_cracker.go

Params:

./warpwallet_cracker [Address] [Salt - optional]

Run (Windows):

run.bat

Run (*nix):

./run.sh

Run unit tests and benchmark:

go test -bench=.