Peter M. O’Donnell on Twitter: "@mjtsai Your particular case of having gotten it over a secure channel cannot securely confer trust to the underlying OS."

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Michael Tsai ‏@mjtsai Mar 3

Previously Downloaded OS X Installers No Longer Work: http://mjtsai.com/blog/2016/03/03/previously-downloaded-os-x-installers-no-longer-work/ … #mjtsaiblog
43 retweets 30 likes
Peter M. O’Donnell ‏@pmod Mar 3

@mjtsai @siracusa Calling certificate-signed software "planned obsolescence" is reductive and entirely ignores the security angles.
Michael Tsai ‏@mjtsai Mar 3

@pmod What exactly is the security angle here?
Peter M. O’Donnell ‏@pmod Mar 3

@mjtsai Code signing with expiring certs? Have you not yet considered that some of the recent hiccups are related to compromised certs??
Michael Tsai ‏@mjtsai Mar 3

@pmod In what scenario would it be beneficial securitywise for Apple to disable their own installers that users downloaded from their store?
Peter M. O’Donnell ‏@pmod Mar 3

@mjtsai Because they had to retire a compromised certificate??
Michael Tsai ‏@mjtsai Mar 3

@pmod Sorry, not following you. Which certificate do you think was compromised? And how could that endanger the installer I already have?
Peter M. O’Donnell ‏@pmod Mar 3

@mjtsai Contemporary cert validation is a security feature, yeah?
Michael Tsai ‏@mjtsai Mar 3

@pmod In general, yes. But in this case I downloaded Apple’s installer from Apple’s server over HTTPS. So how is code signing helping me?

‏@pmod

@mjtsai Your particular case of having gotten it over a secure channel cannot securely confer trust to the underlying OS.

8:08 PM - 3 Mar 2016

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