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Get alerted before an SSL certificate expires (the three checks that actually matter)

Get alerted before an SSL certificate expires (the three checks that actually matter)

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3 min read
Your Certificate Monitoring Only Checks the Leaf. That Is Not the Same Thing as Your Chain Being Valid.

Your Certificate Monitoring Only Checks the Leaf. That Is Not the Same Thing as Your Chain Being Valid.

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5 min read
Their certificate worked in every browser and failed in our service

Their certificate worked in every browser and failed in our service

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2 min read
TLS Handshakes and OAuth Flows Are Easier to Learn by Clicking Through Them

TLS Handshakes and OAuth Flows Are Easier to Learn by Clicking Through Them

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4 min read
Why Your MQTT TLS Connection Fails, Stage by Stage

Why Your MQTT TLS Connection Fails, Stage by Stage

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6 min read
The certificate our partner rotated without telling anyone

The certificate our partner rotated without telling anyone

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2 min read
Python's smtplib doesn't verify TLS certificates by default

Python's smtplib doesn't verify TLS certificates by default

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3 min read
In April, banking was the least post-quantum-ready sector we measured. It is now second from the top.

In April, banking was the least post-quantum-ready sector we measured. It is now second from the top.

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4 min read
The finding was correct and eight weeks late

The finding was correct and eight weeks late

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4 min read
Only 10 of the top 1000 sites hide the hostname you are visiting. I built the tool that counts.

Only 10 of the top 1000 sites hide the hostname you are visiting. I built the tool that counts.

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6 min read
SSL Certificate Name Mismatch: NET::ERR_CERT_COMMON_NAME_INVALID

SSL Certificate Name Mismatch: NET::ERR_CERT_COMMON_NAME_INVALID

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7 min read
The hostname you visit over HTTPS is sent in plain text

The hostname you visit over HTTPS is sent in plain text

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7 min read
Stop saying SSL: TLS only does three jobs, and your 'SSL cert' is usually not the outage

Stop saying SSL: TLS only does three jobs, and your 'SSL cert' is usually not the outage

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3 min read
SSL Certificate Problem: Unable to Get Local Issuer Certificate

SSL Certificate Problem: Unable to Get Local Issuer Certificate

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7 min read
The Kafka Incident That Was Just a Certificate (And the Operator That Saved MirrorMaker)

The Kafka Incident That Was Just a Certificate (And the Operator That Saved MirrorMaker)

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7 min read
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