Ideally, your submission should cover one of the desired topics:- Breaking into Blue Team.- Passing on knowledge.- Building a better tomorrow.- Repurposing/hacking Red Team tools for Blue purposes.- Building countermeasures.- DFIR and the initial steps in IR.- Practical applications of frameworks.- Remediation at scale.
This is by no means exclusive! If you have a talk or workshop on a topic concerning Blue Team matters outside of this list, feel free to submit it - these are guidelines, not firm rules.
This year, the reviewers will be considering an additional factor - alignment with the DC27 theme. Take a look at the main DEFCON site for details on the theme for this year, and consider how your submission can align with it.