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Oliver Buchannon
Ryan Armstrong

Ryan Armstrong is the Manager of Application Security Services at Digital Boundary Group (DBG). Ryan began his infosec career as an application penetration tester and security consultant following completion of his PhD in Biomedical Engineering at Western University (Canada). With a passion for teaching and training, Ryan leads training of application security specialists at DBG, occasionally teaches application security courses at a nearby college in his spare time, and tries to make niche application security testing YouTube content with the time that is left. Drawing on his academic and science advocacy experiences, Ryan hopes to bring more empirical approaches to offensive security testing.

AppSec

Rigorous AppSec - Dec. 14, 2025

Dec 14, 2025

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6 min read

Rigorous AppSec - Dec. 14, 2025

Some things are better not written down at all

Ryan Armstrong
Ryan Armstrong

AppSec

Rigorous AppSec - November 28, 2025

Nov 28, 2025

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12 min read

Rigorous AppSec - November 28, 2025

No one reads anymore

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec - August 3, 2025

Aug 3, 2025

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10 min read

Rigorous AppSec - August 3, 2025

AI All the Way Down

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec - April 29, 2025

Apr 29, 2025

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12 min read

Rigorous AppSec - April 29, 2025

The only non-LLM AppSec newsletter with mostly LLM content.

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec - March 15, 2025

Mar 15, 2025

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11 min read

Rigorous AppSec - March 15, 2025

Not a hiatus, just busy.

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec - October 9, 2024

Oct 9, 2024

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10 min read

Rigorous AppSec - October 9, 2024

Don't use mice models in security research.

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec - September 15, 2024

Sep 15, 2024

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18 min read

Rigorous AppSec - September 15, 2024

More of the same

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec - August 1, 2024

Aug 1, 2024

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10 min read

Rigorous AppSec - August 1, 2024

The LLM Edition

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec 17-07-2024

Jul 17, 2024

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11 min read

Rigorous AppSec 17-07-2024

The certified not vaporware appsec newsletter

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec 29-06-2024

Jun 29, 2024

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3 min read

Rigorous AppSec 29-06-2024

The "just one more appsec newsletter" newsletter

Ryan Armstrong
Ryan Armstrong
Rigorous AppSec

Rigorous AppSec

Insights and resources to build effective AppSec testing teams


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