The masking technique used to solve Kryptos K4 and K5 was Alphanumeric Substitution (ANS) cryptography and character frequency charts. I’m fairly certain K4 was solved in 2016 and K5 was solved in 2023…At least according to http://www.kryptossolved.com it was. Apparently the guy used a 410 ANS Kryptos Note to confirm his solutions.
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