Re: Entropy of certificate serial number

2019-04-11 Thread Hector Martin 'marcan' via dev-security-policy
On 06/04/2019 03.01, Lijun Liao via dev-security-policy wrote: > 5. Related to how the MD5 attacks you might be right. But theoretically, > and also in practice, if you have enough bits to play and the hash > algorithm is not cryptographically secure, you can find a collision with > less

Re: Arabtec Holding public key? [Weird Digicert issued cert]

2019-04-11 Thread Jakob Bohm via dev-security-policy
On 11/04/2019 04:47, Santhan Raj wrote: On Wednesday, April 10, 2019 at 5:53:45 PM UTC-7, Corey Bonnell wrote: On Wednesday, April 10, 2019 at 7:41:33 PM UTC-4, Nick Lamb wrote: (Resending after I typo'd the ML address) At the risk of further embarrassing myself in the same week, while

Re: Arabtec Holding public key?

2019-04-11 Thread Ryan Hurst via dev-security-policy
True, we don't know their intentions but we can at least assume they would need private keys to use said certificates with any properly implemented user agent. Ryan Hurst (personal capacity) On Thu, Apr 11, 2019 at 6:12 PM Peter Gutmann wrote: > admin--- via dev-security-policy > writes: > >

Re: Arabtec Holding public key?

2019-04-11 Thread Peter Gutmann via dev-security-policy
admin--- via dev-security-policy writes: >The risk here, of course, is low in that having a certificate you do not >control a key for doesn't give you the ability to do anything. As far as we know. Presumably someone has an interesting (mis)use for it otherwise they wouldn't have bothered

Re: Arabtec Holding public key?

2019-04-11 Thread admin--- via dev-security-policy
Unfortunately, the BRs make no stipulation on how Proof of Possession is done (https://github.com/cabforum/documents/blob/master/docs/BR.md#321-method-to-prove-possession-of-private-key). Most CAs, in my experience, simply treat the signature on the CSR as sufficient to demonstrate control of a

Re: Arabtec Holding public key?

2019-04-11 Thread Mirro via dev-security-policy
在 2019年4月11日星期四 UTC+8上午7:41:33,Nick Lamb写道: > (Resending after I typo'd the ML address) > > At the risk of further embarrassing myself in the same week, while > working further on mimicking Firefox trust decisions I found this > pre-certificate for Arabtec Holding PJSC: > >