The enigmatic string "F Efzz" has captured the attention from cryptographers and codebreakers for years. Its purportedly random nature presents a formidable challenge, causing many to speculate about its real meaning. https://hikarunoguchi.com/2007/06/%e3%83%9e%e3%83%9e%e5%8f%8b%e8%b6%a3%e5%91%b3/