Shorter and composed of actual words, I think.
Ah, I just took a quick look at the Electrum website. You are correct. The Electrum Seed phrase is generated as 128 random bits. A private key on the other hand is 256 random bits. So apparently, once 128 bit keys can be brute-forced, then Electrum passphrases will be brute-forceable as well. Personally, I'm not concerned about an ability to brute force a random 128 bit passphrase in my lifetime. I suppose if technology does get close to that, then people with Electrum wallets will need to upgrade and move their coins to a new wallet with higher entropy passphrases.
So the endgame for those types of wallets would be to send all coins to a different wallet, incurring a transaction fee? I'd assume if you could regenerate it from a seed, the master key would be compromised.
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