They managed it without any collision several times: https://arstechnica.com/security/2016/08/cisco-confirms-nsa-linked-zeroday-targeted-its-firewalls-for-year

They managed it without any collision several times: https://arstechnica.com/security/2016/08/cisco-confirms-nsa-linked-zeroday-targeted-its-firewalls-for-years/ https://arstechnica.com/security/2016/08/cisco-confirms-nsa-... https://www.theregister.co.uk/2010/12/15/openbsd_backdoor_claim/ https://www.theregister.co.uk/2010/12/15/openbsd_backdoor_cl...