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certificates

Why won’t Safari open that web page?

Did you think it was only old Mac OS X affected by the Let’s Encrypt certificate expiry problem? No, it’s Safari wherever you can use it. Here’s how to deal with it.

October 1, 2021 General, Macs, Technology

El Capitan and older Mac OS X are about to have a security certificate problem

If you’re still running El Capitan, or any version of Mac OS X prior to 10.12.1, then you’re […]

September 21, 2021 Macs, Technology

Is Apple keeping its promises over online OCSP certificate checks?

Nine months ago, Apple undertook to make changes in the way in which macOS checks its OCSP service for certificate revocations. Has it changed anything yet?

August 12, 2021 Macs, Technology

A Short History of Malware Protection in macOS

From the start of voluntary code signing in 2007, defences against malware in macOS have changed dramatically. Here’s an overview of what has happened.

July 26, 2021 Macs, Technology

macOS has checked app signatures online for over 2 years

Why does it take 2 years to realise that macOS has been checking signing certificate validity online?

November 25, 2020 Macs, Technology

Checks on executable code in Catalina and Big Sur: a first draft

How macOS checks executable code before it’s loaded and run, in macOS 10.15 and 11.0. Covering integrity checks using hashes, and validity of the signing certificate, on Intel and ARM.

November 16, 2020 Macs, Technology

Last Week on My Mac: Making essential services fail-safe

Although most were worried about Apple’s failure to deliver upgrades to Big Sur, the most serious problem left many users unable to launch any apps.

November 15, 2020 Macs, Technology

Code signatures: 3 Fixing signature problems

If you have no other option and can be certain there’s no danger in doing so, you can remove a signed app’s signature. But it may not be so simple.

November 3, 2020 Macs, Technology

Code signatures: 2 How to check them

When macOS won’t let you open an app or other software because it warns that it’s (possibly) malware, here’s how to check the signatures.

October 30, 2020 Macs, Technology

Code signatures: 1 How they work, and stop working

The benefits of code signing for Mac users explained. How certificates are revoked, and what happens when they are. And there’s more to signatures than just the certificate.

October 28, 2020 Macs, Technology

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