Last week a document on security considerations for Dynamics AX development was published.This 40 page document is a must-read for every X++ developer.

Topics covered:

• How to use dangerous APIs in a safe manner
• Code Access Security in X++
• Data Authorization
• Credentials and Cryptography
• Server-side batch processing
• New best practice rules
  (Those prefixed with "TwC" - you might already have seen them)

The document is available here:

http://www.microsoft.com/downloads/details.aspx?FamilyID=5e050494-1613-4b3a-9363-d69d60c56877&DisplayLang=en