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Bitcoin brain wallets based on obscure Africa poems have been successfully cracked. Don't trust your choice of obscure books to be sufficient.
by Natanael_L 9y ago
Bitcoin brain wallets based on obscure Africa poems have been successfully cracked. Don't trust your choice of obscure books to be sufficient.
- chiph 9y agoI need to look into that some. If I walk into a library, pick a floor, aisle, shelf, book, and page at random (just walk, don't think about it), and use a phrase that is a minimum of 12 words long -- is that more random than what I presume happened here, where someone knew that their target liked that style of poetry and was able to concentrate their search on that genre? ( a "crib" in Bletchley Park terms) The comments about English grammar are correct - classes of words (nouns, verbs, adverbs, etc) do fall in certain positional order and frequency analysis becomes important. A brute-force attacker would have to work through four types of passwords - the commonly used passwords like "12345" and "letmein", language-based phrases (like my not-great idea), language-based phrases with letter substitution (leet-speak, etc), and then truly random letter sequences.
- Natanael_L 9y agoWhat's happening is that people collect endless phrases and alter them with a ton of standard manipulation schemes, compute the corresponding private and public keys & addresses for all the variations, create a lookup table for the addresses and private keys, and as soon as they see a known keypair in use then they use the corresponding private key to swipe the funds.