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History’s 10 Most Legendary Uncracked Codes

From five lines of letters scrawled on the back of a dead man’s book to the taunting codes sent to police by the Zodiac Killer, some of history’s most legendary uncracked codes and ciphers represent a fascinating and frustrating challenge even for the world’s brightest cryptographers.

The Wall

  The title “The Wall” is derived from a name of bmx trick “wallride” — the trick that involves crossing a vertical surface of obstacle, so-called the wall. DIGITAL VERSION: Photography: Michał Sikora (