https://cm9i.com/writing/ Recent content in Writing on Rob Berry Hugo -- 0.152.2 en-gb Mon, 02 Mar 2026 12:23:56 +0000 https://cm9i.com/writing/modern-day-cracking-of-the-multiplication-code/ Mon, 02 Mar 2026 12:23:56 +0000 https://cm9i.com/writing/modern-day-cracking-of-the-multiplication-code/ How modern computing can crack the "Multiplication code" and how to make it stronger. https://cm9i.com/writing/python-encryption-and-decryption-of-the-multiplication-code/ Mon, 02 Mar 2026 10:02:00 +0000 https://cm9i.com/writing/python-encryption-and-decryption-of-the-multiplication-code/ A Python implementation of the Agent Zigzag (Eddie Chapman) WWII "Multiplication code". https://cm9i.com/writing/multiplication-code/ Sun, 22 Feb 2026 20:03:14 +0000 https://cm9i.com/writing/multiplication-code/ Discover the "multiplication code" used by WWII double agent Eddie Chapman. Learn how a simple keyword and basic math created a powerful, manual Gronsfeld cipher. https://cm9i.com/writing/cryptography-in-world-war-ii/ Sat, 21 Feb 2026 22:36:42 +0000 https://cm9i.com/writing/cryptography-in-world-war-ii/ Explore the history of WWII cryptography: from the Polish mathematicians who cracked Enigma to the Navajo Code Talkers and the birth of the first digital computer. https://cm9i.com/writing/the-core-service-rule-for-aws-architects/ Mon, 19 Jan 2026 20:34:24 +0000 https://cm9i.com/writing/the-core-service-rule-for-aws-architects/ Why you should stick to AWS core services like ECS and S3. Learn from the App Runner deprecation: "Use the thing, not the thing that wraps the thing."