In this 67th episode of The Security Ledger Podcast, we talk with Bob Rudis of the firm Rapid7 about KRACK, a security hole that affects most wi-fi hotspots. Also: Or Katz of Akamai talks about that company’s work analyzing fast-flux botnets, which have become like AirBnB for cyber criminals looking for a place to host malicious networks. Finally: Tim Jarrett of Veracode tells us how a single security hole in an open source library found its way into millions of applications.