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http://minilock.io/ "miniLock asks the user for their passphrase which it then uses to derive the user’s private and public keys. The user can establish their key pair on any computer that has miniLock installed using only this passphrase. Keys are easily tweetable."
...being crushed on HN: https://news.ycombinator.com/item?id=8058724 ‎- 9000