Groups

Certificate Transparency Policy

1–30 of 484

Please note, this list is for discussions and announcements related to policies and support for Certificate Transparency (RFC 6962) within Chromium- and Firefox-based browsers, as well as Apple clients. This includes discussions of requirements for Logs, as well as requirements for CAs' support for CT.

For more information, see https://certificate.transparency.dev

For bug reports and discussions of bugs related to Chromium, please use https://issues.chromium.org/issues/new

For bug reports and discussions of bugs related to Firefox, please use https://bugzilla.mozilla.org/enter_bug.cgi

For discussions of the technical details of Certificate Transparency, please use the IETF TRANS mailing list, https://www.ietf.org/mailman/listinfo/trans

0 selected

Michel Le Bihan, … Philippe Boneff5

Oct 7

Undocumented and variable get-entries limits across CT logs

Hi Michel, You might find this piece of documentation useful: it explains a few of these behaviours,

unread,

Undocumented and variable get-entries limits across CT logs

Hi Michel, You might find this piece of documentation useful: it explains a few of these behaviours,

Oct 7

Michel Le Bihan, … Rick Roos6

Oct 6

Frequent 502/503 errors from DigiCert Wyvern 2026h1 log

Hi Carlos, you should be seeing a recovery on that endpoint as of now. It appears as the load on that

unread,

Frequent 502/503 errors from DigiCert Wyvern 2026h1 log

Hi Carlos, you should be seeing a recovery on that endpoint as of now. It appears as the load on that

Oct 6

Oct 6

Low add-chain availability on Nimbus2026 log

Hi folks, Between 2025-10-03 01:00 UTC and 2025-10-06 6:30 UTC, Cloudflare's Nimbus2026 log was

unread,

Low add-chain availability on Nimbus2026 log

Hi folks, Between 2025-10-03 01:00 UTC and 2025-10-06 6:30 UTC, Cloudflare's Nimbus2026 log was

Oct 6

Jin Tong, Ben Laurie2

Oct 4

The impact of MitM attack in CT

This is not a question about CT but rather about CAs and browsers. The incident that triggered the

unread,

The impact of MitM attack in CT

This is not a question about CT but rather about CAs and browsers. The incident that triggered the

Oct 4

Oct 3

Update to Chrome's CT Log Policy

Hi folks, Today, we published a small update to our CT log policy, which covers the Chrome CT

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Update to Chrome's CT Log Policy

Hi folks, Today, we published a small update to our CT log policy, which covers the Chrome CT

Oct 3

Matthew McPherrin

Sep 23

Oak 2025h2 Storage Limits

Hello CT Folks, Let's Encrypt is concerned about the possibility of our Oak 2025h2 shard hitting

unread,

Oak 2025h2 Storage Limits

Hello CT Folks, Let's Encrypt is concerned about the possibility of our Oak 2025h2 shard hitting

Sep 23

Filippo Valsorda

Sep 22

Archiving Certificate Transparency Logs

Hello fellow mortals, After chatting with some of you, including Philippe, Rasmus, and Ben, I built a

unread,

Archiving Certificate Transparency Logs

Hello fellow mortals, After chatting with some of you, including Philippe, Rasmus, and Ben, I built a

Sep 22

Rob Stradling, Joe DeBlasio2

Sep 18

All Mammoth and Sabre shards will stop accepting submissions today

Thank you Rob. Tiger logs should now be visible as Usable in Chrome's log list as well. Caching

unread,

All Mammoth and Sabre shards will stop accepting submissions today

Thank you Rob. Tiger logs should now be visible as Usable in Chrome's log list as well. Caching

Sep 18

Sep 18

Tiger2025h2 submission failures in early September

On September 2nd, the Chrome CT team notified Sectigo that: "We've been tracking an increase

unread,

Tiger2025h2 submission failures in early September

On September 2nd, the Chrome CT team notified Sectigo that: "We've been tracking an increase

Sep 18

Andrew Ayer, … Rick Roos4

Sep 9

Wyvern 2025h2 and Sphinx 2025h2 get-entries outage

I wanted to give an update on the current status of these logs. This morning we have enabled these

unread,

Wyvern 2025h2 and Sphinx 2025h2 get-entries outage

I wanted to give an update on the current status of these logs. This morning we have enabled these

Sep 9

Filippo Valsorda

Sep 8

Precertificate Signing Certificates and Where to Find Them

Hello fellow mortals, A few weeks ago I collected some data on the prevalence of Precertificate

unread,

Precertificate Signing Certificates and Where to Find Them

Hello fellow mortals, A few weeks ago I collected some data on the prevalence of Precertificate

Sep 8

Luke Valenta, … Andrew Ayer16

Sep 2

Cloudflare Raio and Nimbus2027 log shards

Hi folks, The Raio log shards are now all fully repaired to include the accepted root in each

unread,

Cloudflare Raio and Nimbus2027 log shards

Hi folks, The Raio log shards are now all fully repaired to include the accepted root in each

Sep 2

umar, … Phil Porada4

Aug 28

Rate Limits of get-entries for Sectigo & Let's encrypt & TrustAsia

Hi Umar, Trillian-based logs should be setting `max_get_entries` and `align_getentries` in the `ctfe`

unread,

Rate Limits of get-entries for Sectigo & Let's encrypt & TrustAsia

Hi Umar, Trillian-based logs should be setting `max_get_entries` and `align_getentries` in the `ctfe`

Aug 28

Joe DeBlasio, Rob Stradling4

Aug 28

MMD violations in mammoth2025h2

Hi Joe. Mammoth2025h2's submission backlog cleared at approximately 23:00 UTC yesterday. We won

unread,

MMD violations in mammoth2025h2

Hi Joe. Mammoth2025h2's submission backlog cleared at approximately 23:00 UTC yesterday. We won

Aug 28

Aug 27

Introducing TesseraCT static logs: Lipase and Halloumi

Hoi colleagues, I'm uncomfortably excited to announce the second of two Static Certificate

unread,

Introducing TesseraCT static logs: Lipase and Halloumi

Hoi colleagues, I'm uncomfortably excited to announce the second of two Static Certificate

Aug 27

Filippo Valsorda, … Martin Hutchinson11

Aug 22

The names tiles Static CT API extension

The names tiles experiment has landed in Sunlight, and was rolled out to Tuscolo and the Let's

unread,

The names tiles Static CT API extension

The names tiles experiment has landed in Sunlight, and was rolled out to Tuscolo and the Let's

Aug 22

Aug 21

Transparency.dev Summit August 31st deadline approaching

Hi everyone, A reminder that August 31st is fast approaching, and that is the Transparency.dev Summit

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Transparency.dev Summit August 31st deadline approaching

Hi everyone, A reminder that August 31st is fast approaching, and that is the Transparency.dev Summit

Aug 21

Rob Stradling, … Joe DeBlasio16

Aug 20

Improving Sectigo's RFC6962 logs and introducing CF_CTile

This is odd - https://valid.apple.com/ct/log_list/current_log_list.json currently shows "

unread,

Improving Sectigo's RFC6962 logs and introducing CF_CTile

This is odd - https://valid.apple.com/ct/log_list/current_log_list.json currently shows "

Aug 20

Chuck Blevins, … Chuck Blevins7

Aug 14

DigiCert 2027 logs

Sorry I had to regroup to get the info for the application info you sent. We will submit shortly On

unread,

DigiCert 2027 logs

Sorry I had to regroup to get the info for the application info you sent. We will submit shortly On

Aug 14

Matthew McPherrin

Aug 14

Let's Encrypt Static CT logs & RFC 6962 EOL.

Hello CT Enthusiasts and begrudging , Let's Encrypt has applied to the CT log programs with our

unread,

Let's Encrypt Static CT logs & RFC 6962 EOL.

Hello CT Enthusiasts and begrudging , Let's Encrypt has applied to the CT log programs with our

Aug 14

Philippe Boneff

Aug 14

Introducing TesseraCT Alpha

Hi everyone, We are really excited to announce that the alpha of our tile-based CT log implementation

unread,

Introducing TesseraCT Alpha

Hi everyone, We are really excited to announce that the alpha of our tile-based CT log implementation

Aug 14

Hilton De Meillon, … Matthew McPherrin8

Aug 13

I'd like to explore running a Sunlight CT server

Ok I have my server prepped and am having some issues getting sunlight and skylight running. Here are

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I'd like to explore running a Sunlight CT server

Ok I have my server prepped and am having some issues getting sunlight and skylight running. Here are

Aug 13

David Benjamin, … Ben Laurie4

Aug 11

Merkle Tree Certificates (a.k.a. Photosynthesis)

We wrote up revocation transparency long ago, using spare Merkle trees... On Fri, 8 Aug 2025 at 21:39

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Merkle Tree Certificates (a.k.a. Photosynthesis)

We wrote up revocation transparency long ago, using spare Merkle trees... On Fri, 8 Aug 2025 at 21:39

Aug 11

Andrew Ayer, … Martin Hutchinson6

Aug 8

Unable to monitor Google Argon

Thanks Martin! It's looking good - I haven't gotten any errors in the last 40 minutes.

unread,

Unable to monitor Google Argon

Thanks Martin! It's looking good - I haven't gotten any errors in the last 40 minutes.

Aug 8

Jul 31

Introducing Static CT Log: Rennet and Gouda

Hoi colleagues, I'm excited to announce the first of two Static Certificate Transparency logs,

unread,

Introducing Static CT Log: Rennet and Gouda

Hoi colleagues, I'm excited to announce the first of two Static Certificate Transparency logs,

Jul 31

Jul 30

Discontinuing Qualified/Rejected log announcements

Hi folks, Chrome's CT team is discontinuing our announcements highlighting when new CT logs

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Discontinuing Qualified/Rejected log announcements

Hi folks, Chrome's CT team is discontinuing our announcements highlighting when new CT logs

Jul 30

Jul 29

Announcing Newly Qualified Logs -- Tuscolo2027h1 and Tuscolo2027h2

Two new static-ct-api logs have been approved for inclusion in Chrome, having completed their

unread,

Announcing Newly Qualified Logs -- Tuscolo2027h1 and Tuscolo2027h2

Two new static-ct-api logs have been approved for inclusion in Chrome, having completed their

Jul 29

Jul 29

Removal (Rejection) of Expired 2025h1 CT Log Shards

The following CT log shards are now outside of their certificate expiry range and have been removed

unread,

Removal (Rejection) of Expired 2025h1 CT Log Shards

The following CT log shards are now outside of their certificate expiry range and have been removed

Jul 29

Andrew Ayer, … Mustafa Emre Acer7

Jul 25

TrustAsia CT2025A and CT2025B MMD Violations

Thank you for the detailed update and the fixes, Xiaoming! On Friday, July 25, 2025 at 9:17:04 AM UTC

unread,

TrustAsia CT2025A and CT2025B MMD Violations

Thank you for the detailed update and the fixes, Xiaoming! On Friday, July 25, 2025 at 9:17:04 AM UTC

Jul 25

Jul 21

Removal of uptime.csv

Hi folks, In Dec. 2023, we announced changes to how we monitor logs for compliance with Chrome's

unread,

Removal of uptime.csv

Hi folks, In Dec. 2023, we announced changes to how we monitor logs for compliance with Chrome's

Jul 21

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