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

Top Rated Comments

Sasparilla Avatar
46 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
46 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
46 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
46 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
46 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
46 months ago
Planned obsolescence...smh...
Score: 2 Votes (Like | Disagree)

Popular Stories

Cyber Monday Deals Feature 2022

Best Cyber Monday Apple Deals Still Available for AirPods, Apple TV, iPad, and More

Monday November 28, 2022 5:24 am PST by
The Black Friday and Cyber Monday holiday shopping rush is drawing to a close, but there are still some good deals to be had out there. For Apple products, many of the deals you've seen since last week are still available, though some have expired. So for anyone who missed out on Black Friday deals, there's still an opportunity to get some of the year's best prices on many Apple devices. Note: ...
iPhone 14 Pro Rear Camera

iPhone 15 to Use 'State-of-the-Art' Image Sensor From Sony for Better Low-Light Performance

Monday November 28, 2022 11:00 am PST by
Apple's upcoming iPhone 15 models will be equipped with Sony's newest "state of the art" image sensors, according to a report from Nikkei. Compared to standard sensors, Sony's image sensor doubles the saturation signal in each pixel, allowing it to capture more light to cut down on underexposure and overexposure. Nikkei says that it is able to better photograph a person's face even with...
Apple Watch Ultra Oceanic Plus App

Apple Announces Oceanic+ App Now Available for Apple Watch Ultra

Monday November 28, 2022 6:11 am PST by
Apple today announced that the Oceanic+ app is available for the Apple Watch Ultra starting today. Designed by Huish Outdoors in collaboration with Apple, the app serves as a dive computer for recreational scuba diving at depths up to 40 meters/130 feet. Apple already offers a basic Depth app on the Apple Watch Ultra for viewing your current depth, maximum depth reached, water temperature,...
app store awards 2021

Apple Announces 2022 App Store Award Winners, Highlighting Best Apps of the Year

Tuesday November 29, 2022 3:10 am PST by
Apple today announced its 2022 App Store Award winners, highlighting the 16 best apps and games selected by Apple's global App Store editorial team. The top apps were chosen by Apple for their quality, innovative technology, creative design, positive cultural impact, and ability to deliver "exceptional experiences." Apple CEO Tim Cook said: This year's App Store Award winners reimagined...
rapid security response

Apple Releases Another Rapid Security Response Update for iOS 16.2 Beta Users

Monday November 28, 2022 10:16 am PST by
Apple today released a Rapid Security Response update that is available for those running the iOS 16.2 beta, marking the launch of the second RSR update since the feature was released in iOS 16. The Rapid Security Response Update is designed to provide iOS 16.2 beta users with bug fixes without the need to install a full update. The initial RSR release for iOS 16.2 beta users was a test with ...
twitter elon musk

Elon Musk Claims Apple Has 'Mostly Stopped' Offering Ads on Twitter and Is Making Moderation Demands

Monday November 28, 2022 10:42 am PST by
Apple has cut back on its Twitter advertising, according to Twitter CEO Elon Musk. In a tweet, Musk said that Apple has "mostly stopped" its Twitter ads, asking if Apple hates "free speech." Musk went on to publish a poll asking if Apple should "publish all censorship actions" taken that impact customers and he began retweeting content from companies that Apple has had moderation discussions ...
iphone 11 tesla cybertruck close up

Elon Musk Pledges to Build iPhone Rival If Apple Ousts Twitter

Tuesday November 29, 2022 2:48 am PST by
Elon Musk has pledged to offer an "alternative phone" if Apple and Google remove Twitter from their app stores, adding to long-standing rumors about an iPhone rival from Tesla. Modified iPhone 11 Pro in the style of the Tesla Cybertruck, by Caviar. Musk's remark came after being asked about the potential scenario of Twitter being removed from app stores, which could conceivably happen if the...
General Black Friday Deals 2022 Green

All the Apple Black Friday Deals You Can Still Get

Friday November 25, 2022 4:40 am PST by
Although Black Friday is now technically over, many Apple products are still seeing major discounts through the weekend as we head into Cyber Monday. In this article, you'll find every Apple device with a notable Black Friday sale that's still available. We'll be updating as prices change and new deals arrive, so be sure to keep an eye out if you don't see the sale you're looking for yet. Note:...