Electrum Bitcoin Cash Support - Comdirect Mein Depot
NVD - CVE-2018-1000022
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Calculate txn_id from raw txn_hex
I'm trying to calculate a txn_id from raw txn_hex. The procedure works fine for legacy TXNs but gets non-expected results on Segwit TXNs. I compared this snippet of code to what txn_id was produced by Electrum and the blockchain.com TXN decoder:
Take in TXN in hex
Convert the hex to binarray
Double hash binarray
Reverse the resultant digest because of endianness
Display in hex.
t0 is my legacy testnet TXN and t1 is my segwit testnet TXN. Thoughts?
Please show me how I'm wrong, because I rather liked Electrum a lot until I found this out. Try restoring a wallet in Electrum by seed words, and try to choose 12 words that are NOT on the following list: https://github.com/spesmilo/electrum/blob/mastelib/mnemonic.py You'll get a "Bad Seed" error and it won't let you proceed. Electrum only generates a 12 word seed from this ~1600ish predefined word list. Period. No ifs, ands, or buts. So, basically, the way I see it is that a hacker could write a script that loops through making random 12-word phrases from the ~1600ish word list that Electrum uses. Then, it can use the actual Python open source code of Electrum to determine how it converts the 12-word phrases into the private key for the account. From there, it could keep trying private keys until it finds a wallet balance somewhere on the blockchain. At that point, a hacker could go in and collect the coins for himself. Might take a room of 10 home PCs to do it in a loop, but eventually I think one might get lucky and get $1M USD in bitcoins this way. Wrong? If not, how so? Check out what this Redditor calculated: http://www.reddit.com/Bitcoin/comments/1s22uz/couldnt_an_idiot_just_pick_12_words_in_electrum/cdt655t
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