[Cryptography] Juniper & Dual_EC_DRBG

Emilien Gaspar y at dud-t.org
Mon Dec 21 17:49:33 EST 2015


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 ? :-)


[0]: https://kb.juniper.net/InfoCenter/index?page=content&id=KB28205&pmv=print&actp=LIST
[1]: https://www.imperialviolet.org/2015/12/19/juniper.html

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