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Articles by Colm MacCárthaigh
AWS European Sovereign Cloud: Engineered for trust
For European organizations operating in regulated industries, sovereignty is not an abstract principle – it is a concrete set of risks around data residency, operational autonomy, and jurisdictional reach that must be managed with the same rigor as any security threat.
Establishing a European trust service provider for the AWS European Sovereign Cloud | Amazon Web Services
Last month, we announced new sovereign controls and governance structure for the AWS European Sovereign Cloud. The AWS European Sovereign Cloud is a new, independent cloud for Europe, designed to help customers meet their evolving sovereignty needs, including stringent data residency, operational autonomy, and resiliency requirements.
AWS SIGv4 and SIGv4A — shufflesharding.com
In the time it takes to read this sentence, the AWS Identity and Access Management (IAM) service will handle several billion requests. Pretty close to every one of those requests is authenticated using the AWS SIGv4 protocol, before IAM authorization policy is applied to check if the request is allowed or not. I didn’t have a hand in designing the AWS SIGv4 protocol so hopefully it’s not too biased to say that I dearly love how AWS SIGv4 works.
[CVE-2019-14899] Inferring and hijacking VPN-tunneled TCP connections.
oss-sec mailing list archives By Date By Thread Re: [CVE-2019-14899] Inferring and hijacking VPN-tunneled TCP connections. From: Colm MacCárthaigh <colm () allcosts net> Date: Wed, 4 Dec 2019 22:37:33 -0800 I work on Amazon Linux, which enables reverse path filtering on all existing interfaces and is not impacted by this issue, however in examining this issue we did notice some additional areas that may be of heightened concern to operating systems or VPNs that are impacted.
PID Loops and the Art of Keeping Systems Stable
Transcript MacCarthaigh: My name is Colm, I'm an engineer at Amazon Web Services and I'm here to talk about PID loops and about how we use them to keep systems stable. I have a subtitle for this talk, which I went back and forth on whether I should give it or not, which is PID loops come from control theory. This is my third or fourth talk, different talk about control theory in the last year.
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