Cybersecurity Blue Team Toolkit. by Nadean H. Tanner. Released April 2019. Publisher (s): Wiley. ISBN: 9781119552932. Read it now on the O'Reilly learning platform with a 10-day free trial. O'Reilly members get unlimited access to live online training experiences, plus books, videos, and digital content from O'Reilly and nearly 200 Look for Base64 encoded data. TXT records are used for SPF, so they do occur. Tools known to use TXT records include dns2tcp or DNScapy. Look-a-Like or fuzzed domains: Review the section Email and Web: Interactions with Look a Like or Doppelganger Domains on page 73 when working through DNS use case development. Are there any good resources on the Internet or books available for increasing your knowledge if you're a Blue Team member? I would love to take some of the SANS courses, but I've allocated my training budget in 2018 for a trip to Black Hat. 21 comments. share. save. hide. report.