This document discusses security challenges at large scale and potential solutions. It notes that traditional security techniques fail when there are too many devices, logs, applications, code updates, and external factors like acquisitions and outsourcing. Attacks become more sophisticated, including distributed denial of service attacks, zero-day exploits, worms, and advanced persistent threats. To address these challenges, the document recommends using technologies like Hadoop, data mining tools, and NodeJS, as well as taking a proactive approach through continuous discovery, detection of vulnerabilities and abuse, analysis of code and systems, and employee training.