Apple Drops Support for SHA-1 Certificates in macOS Catalina and iOS 13

In a new support document, Apple has indicated that macOS Catalina and iOS 13 drop support for TLS certificates signed with the SHA-1 hash algorithm, which is now considered to be insecure. SHA-2 is now required at a minimum.

macos catalina safari
Apple says all TLS server certificates must comply with these new security requirements in macOS Catalina and iOS 13:

  • TLS server certificates and issuing CAs using RSA keys must use key sizes greater than or equal to 2048 bits. Certificates using RSA key sizes smaller than 2048 bits are no longer trusted for TLS.

  • TLS server certificates and issuing CAs must use a hash algorithm from the SHA-2 family in the signature algorithm. SHA-1 signed certificates are no longer trusted for TLS.

  • TLS server certificates must present the DNS name of the server in the Subject Alternative Name extension of the certificate. DNS names in the CommonName of a certificate are no longer trusted.

Effective immediately, any connections to TLS servers violating these new requirements will fail and may cause network failures, apps to fail, and websites to not load in Safari in macOS Catalina and iOS 13, according to Apple.

Google, Microsoft, and Mozilla all deprecated SHA-1 certificates in 2017.

Tags: Safari, SHA-1
Related Forums: iOS 13, macOS Catalina

Popular Stories

iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro to Reverse iPhone X Design Decision

Monday July 7, 2025 9:46 am PDT by
Since the iPhone X in 2017, all of Apple's highest-end iPhone models have featured either stainless steel or titanium frames, but it has now been rumored that this design decision will be coming to an end with the iPhone 17 Pro models later this year. In a post on Chinese social media platform Weibo today, the account Instant Digital said that the iPhone 17 Pro models will have an aluminum...
iOS 26 Feature

Everything New in iOS 26 Beta 3

Monday July 7, 2025 1:20 pm PDT by
Apple is continuing to refine and update iOS 26, and beta three features smaller changes than we saw in beta 2, plus further tweaks to the Liquid Glass design. Apple is gearing up for the next phase of beta testing, and the company has promised that a public beta is set to come out in July. Transparency In some apps like Apple Music, Podcasts, and the App Store, Apple has toned down the...
imac video apple feature

Apple Launching These 15+ Products Later This Year

Sunday July 6, 2025 8:05 am PDT by
The calendar has turned to July, meaning that 2025 is now more than half over. And while the summer months are often quiet for Apple, the company still has more than a dozen products coming later this year, according to rumors. Below, we have outlined at least 15 new Apple products that are expected to launch later this year, along with key rumored features for each. iPhone 17 Series iPho...
iphone 16 pro models 1

Here's How the iPhone 17 Pro Max Will Compare to the iPhone 17 Pro

Saturday July 5, 2025 1:00 pm PDT by
Apple should unveil the iPhone 17 series in September, and there might be one bigger difference between the Pro and Pro Max models this year. As always, the Pro Max model will be larger than the Pro model:iPhone 17 Pro: 6.3-inch display iPhone 17 Pro Max: 6.9-inch displayGiven the Pro Max is physically larger than the Pro, it has more internal space, allowing for a larger battery and...
iPhone Car Key Kia

Here's Which Vehicles Offer iPhone Car Keys

Sunday July 6, 2025 3:03 pm PDT by
In 2020, Apple added a digital car key feature to its Wallet app, allowing users to lock, unlock, and start a compatible vehicle with an iPhone or Apple Watch. The feature is currently offered by select automakers, including Audi, BMW, Hyundai, Kia, Genesis, Mercedes-Benz, Volvo, and a handful of others, and it is set to expand further. Apple has a web page with a list of vehicle models that ...
apple wallet drivers license feature iPhone 15 pro

Apple Says iPhone Driver's Licenses Will Expand to These 8 U.S. States

Tuesday July 8, 2025 11:26 am PDT by
In select U.S. states, residents can add their driver's license or state ID to the Wallet app on the iPhone and Apple Watch, providing a convenient and contactless way to display proof of identity or age at select airports and businesses, and in select apps. Unfortunately, this feature continues to roll out very slowly since it was announced in 2021, with only nine U.S. states, Puerto Rico,...
iphone 17 pro render majin bu

New iPhone 17 Pro Renders Highlight Apple Logo and MagSafe Design Changes

Sunday July 6, 2025 8:43 pm PDT by
New renders today provide the best look yet relocated Apple logo and redesigned MagSafe magnet array of the iPhone 17 Pro and iPhone 17 Pro Max. Image via Majin Bu. Several of the design changes coming to the iPhone 17 Pro model have been rumored for some time, such as the elongated camera bump that spans the full width of the device, with the LiDAR Scanner and flash moving to the right side. ...
apple account card feature

Apple Account Card Expanding to More Countries

Tuesday July 8, 2025 7:34 pm PDT by
Apple is expanding the ability to add an Apple Account Card to the Wallet app to more countries, according to backend Apple Pay changes. With iOS 15.5, Apple updated the Wallet app to allow users to add an Apple Account Card, which displays the Apple credit balance associated with an Apple ID. If you receive an Apple gift card, for example, it is added to an Apple Account that is also...
iPhone 17 Pro in Hand Feature Lowgo

iPhone 17 Pro Coming Soon With These 14 New Features

Friday July 4, 2025 1:05 pm PDT by
Apple's next-generation iPhone 17 Pro and iPhone 17 Pro Max are just over two months away, and there are plenty of rumors about the devices. Below, we recap key changes rumored for the iPhone 17 Pro models. Latest Rumors These rumors surfaced in June and July:Apple logo repositioned: Apple's logo may have a lower position on the back of the iPhone 17 Pro models, compared to previous...

Top Rated Comments

Sasparilla Avatar
80 months ago
Nice to see them doing this.

Planned obsolescence...smh...
For an insecure encryption algorithm? I would hope they'd deprecate it (following Google, Firefox etc.).
Score: 17 Votes (Like | Disagree)
SteveOfTheStow Avatar
80 months ago
For an insecure encryption algorithm? I would hope they'd deprecate it (following Google, Firefox etc.).
There was an implicit /s in vicviper789's post ;)
Score: 5 Votes (Like | Disagree)
keysofanxiety Avatar
80 months ago
Planned obsolescence...smh...
I know, it's a disgrace. Little known fact: very few websites work well on Netscape Navigator either :mad:
Score: 5 Votes (Like | Disagree)
Soba Avatar
80 months ago
Planned obsolescence...smh...
I get your point and share the frustration, but it's not warranted in this case.

Encryption algorithms have shelf lives, more or less. Weaknesses are periodically discovered that make them vulnerable to cracking or workarounds, as in this case. Generally these problems cannot be fixed in the way ordinary software is patched because the problems are not specific to any vendor and are simply fundamental flaws in the encryption mechanism; the only solution is abandonment of the encryption method and moving on to safer methods.

SHA-1 is over 25 years old and has been known to have problems since at least 2005. Deprecating encryption methods that are known to be too weak or vulnerable is the right thing to do, and if anything, this move is long overdue.
[doublepost=1559832487][/doublepost]
I know, it's a disgrace. Little known fact: very few websites work well on Netscape Navigator either :mad:
I miss Netscape. ;)

I have to laugh at the 40-bit encryption we used in the late 90s (32-bit in some parts of the world). It wasn't thought overly safe even at the time, but that seems just silly, today.
Score: 4 Votes (Like | Disagree)
darngooddesign Avatar
80 months ago
There was an implicit /s in vicviper789's post ;)
It’s impossible to tell if someone is being sincere or sarcastic on the internet; which is why we have ‘/s’.
Score: 4 Votes (Like | Disagree)
vicviper789 Avatar
80 months ago
Planned obsolescence...smh...
Score: 2 Votes (Like | Disagree)