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Andrew Ayer

@andrew_ayer@robot.villas

Andrew Ayer's technical writing on TLS, certificate authorities, security, Go, networking, and software infrastructure.

Source: https://www.agwa.name/blog/feed

Homepage: https://www.agwa.name/blog

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  • sourcespotter-authorize: Monitor Your Go Modules for Malicious Versions, Without the Noise #Go #Security #DevOps

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    Oct 6, 2026

  • macOS Can't Clone "Dumb" Git Repositories Over HTTP/2 #Tech #Security #Networking

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    Sep 24, 2026

  • FastCGI: 30 Years Old and Still the Better Protocol for Reverse Proxies #Tech #Networking #OpenSource

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    Apr 29, 2026

  • Why IP Address Certificates Are Dangerous and Usually Unnecessary #Security #Networking #TLS

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    Feb 19, 2026

  • Certificate Authorities Are Once Again Issuing Certificates That Don't Work #Security #Networking #Certificates

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    Dec 10, 2025

  • Google Just Suspended My Company's Google Cloud Account for the Third Time #Security #CloudComputing #Tech

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    Nov 3, 2025

  • I'm Independently Verifying Go's Reproducible Builds #GoLang #Security #OpenSource

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    Oct 29, 2025

  • SQLite's Durability Settings are a Mess #Tech #Databases #OpenSource

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    Aug 29, 2025

  • The Story Behind Last Week's Let's Encrypt Downtime #Security #LetsEncrypt #Networking

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    Jun 22, 2023

  • The Difference Between Root Certificate Authorities, Intermediates, and Resellers #Security #Networking #Infrastructure

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    Jun 18, 2023

  • The SSL Certificate Issuer Field is a Lie #Security #Networking #TLS

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    Jan 18, 2023

  • whoarethey: Determine Who Can Log In to an SSH Server #Security #SSH #Networking

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    Jan 10, 2023

  • No, Google Did Not Hike the Price of a .dev Domain from $12 to $850 #Tech #Security #Networking

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    Dec 12, 2022

  • Checking if a Certificate is Revoked: How Hard Can It Be? #Security #Networking #TLS

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    Dec 1, 2022

  • Parsing a TLS Client Hello with Go's cryptobyte Package #Go #TLS #Networking

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    May 18, 2022

  • How I'm Using SNI Proxying and IPv6 to Share Port 443 Between Webapps #Networking #Security #IPv6

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    Apr 15, 2022

  • Comcast Shot Themselves in the Foot with MTA-STS #Security #Networking #Email

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    Jan 19, 2022

  • It's Now Possible To Sign Arbitrary Data With Your SSH Keys #Security #SSH #Cryptography

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    Nov 12, 2021

  • How Certificate Transparency Logs Fail and Why It's OK #Security #Networking #TLS

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    Jul 9, 2021

  • Security Vulnerabilities in Smallstep PKI Software #Security #PKI #Tech

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    Dec 17, 2020

  • The Lengths People Go To Just To Avoid DNSSEC #Security #Networking #DNS

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    Nov 30, 2020

  • Writing an SNI Proxy in 115 Lines of Go #Go #Networking #Security

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    Jun 25, 2020

  • Security Review of CFSSL Signer Code #Security #TLS #Go

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    Jun 18, 2020

  • Fixing the Breakage from the AddTrust External CA Root Expiration #Security #Networking #Infrastructure

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    May 30, 2020

  • Short Take: Why Trust-On-First-Use Doesn't Work (Even for SSH) #Security #Networking #Tech

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    Feb 8, 2020

  • When Will Your DNS Record Be Published? #Networking #DNS #Security

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    Feb 3, 2020

  • This Is Why You Always Review Your Dependencies, AGPL Edition #Security #Software #OpenSource

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    Jan 4, 2020

  • Preventing Server Side Request Forgery in Golang #Golang #Security #Programming

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    Dec 20, 2019

  • Programmatically Accessing Your Customers' Google Cloud Accounts (While Avoiding the Confused Deputy Problem) #Cloud #Security #Go

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    Dec 3, 2019

  • MTA-STS is Hard. Here's how DNS Providers Can Make it Awesome With Automation... #Security #Networking #Automation

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    Apr 15, 2019