On Tue, Aug 16, 2016 at 10:22:36PM -0700, [email protected] wrote:
> and have been issuing SHA-256 SSL certificates under "Hongkong Post e-Cert
> CA 1- 14" and "Hongkong Post e-Cert CA 1 - 15" respectively

"respectively" in what sense?

> This certificate is a client certificate issued to a person for private
> use such as digital signature and encryption of electronic messages, but
> not for SSL server communication.

What mitigations are in place to prevent someone from using a chosen prefix
attack to obtain a valid signature issued under this CA which is also valid
for a certificate which *could* be used for SSL server communication?

- Matt

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