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doubleslow
Doubleslow Keystretcher: Key stretching on an air-gapped computer with additional "external key stretching" on another computer
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The key stretching with the "seed extension" (also known as "extension word" and "passphrase") in the BIP39 specification is very weak (PBKDF2 using 2048 iterations of HMAC-SHA512), this is why I wrote Doubleslow Keystretcher.
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