# Generate key pair deterministically from a particular seed

I've been reading "SQRL Secure QR Login" at Gibson's website, and I'm wondering if there is a way to generate an RSA private/public key-pair based on some cryptographically secure input, so that if the input stays the same we keep getting the same key pair on the output.

The linked web-site uses elliptic curve cryptography to achieve this property. Is it not possible with RSA?

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ecliptic $\mapsto$ elliptic $\:$ ? $\;\;\;$ –  Ricky Demer Oct 3 at 3:53