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Dual-ec-drbg is short for Dual Elliptic Curve Deterministic Random Bit Generator; a pseudorandom number generator based on the elliptic curve discrete logarithm problem.

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Can the backdoor in Dual_EC_DRBG be used to create a public key stream cipher?

You can do something like what you are suggesting. But, the EC_Dual_DBRG also has biases in the stream and so you cannot use it without changes (e.g., truncating much more). However, this is based on …
Yehuda Lindell's user avatar