I have published an article over on our online training site, CyberAwake, that looks at how businesses can leak what appears to be insignificant information, that a hacker can collect and assemble into a picture that can comprise your cyber security:
The Basics of Cyber Security – A quick look at OSINT and Redacting (cyberawake.co.uk)
Clive Catton MSc (Cyber Security) – by-line and other articles
Further Reading
Crypto for the weekend – Smart Thinking Solutions