[Cryptography] Juniper & Dual_EC_DRBG

Natanael natanael.l at gmail.com
Tue Dec 22 10:41:39 EST 2015

Den 22 dec 2015 16:32 skrev "Emilien Gaspar" <y at dud-t.org>:
> oy,
> it seems that Juniper used Dual_EC_DRBG with their own backdoored
> constants[0]. Worse, they discovered that some constants was changed to
> insert a backdoor in ScreenOS that allow passive VPN decryption. It's
> not exactly clear how, but agl report on his blog[1] after a twitter
> conversion that it might be a simple replacement of the backdoored
> constants of Dual_EC_DRBG used in ScreenOS.
> One thing that I still don't understand is their custom paramters for
> the curve used by Dual_EC and what was exactly modified by the attacker.
> Do we have more explanations now ? :-)
> eg.
> [0]:
> [1]: https://www.imperialviolet.org/2015/12/19/juniper.html

Backdoor proof of concept with custom parameters:

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