2020 NSA Science of Security Puzzle

You found the QR code hint on the National Security Agency ad in Science News. Congrats on finding that first hint and and hopefully to solving the encrypted message.  The great thing about the chosen cipher is that it is doable by hand but yet sufficiently challenging. I think this balance is fair, so have fun playing with the puzzle and good luck.

To help you out, here is the text of the the puzzle, you don't need to type it in.

tvbscnrwdlrnlgpf

adnfbnrucbqprnoi

pbshfrcavqsnhpad

imrhlxebipkrcnbc

gtzarsirbospavql

pxtqmiahsrbaqowo

pbwncnvcqrrszpnr

srienrndxcadpmny

ebnpocpbvascaest

srcaxsrierangmse

rmtvsntfbargqlcn

btpupbvaqmsnecoq

srtvsnirzpipblah

apqrhtaqxlglclco

pqhagaqorpaepksn

tfqhwpbalivrbnsn

As you go to solve the puzzle remember that persistence is the key.

Looking for last year's puzzle? : https://cps-vo.org/node/60212