Unbreakable: Eight codes we can't crack

(Image: Time Life Pictures/Getty)
The capture of the Enigma code machine 70 years ago changed the course of the second world war. But the secret codes broken by this event were not history’s toughest ciphers. Plenty of codes are uncracked and, as MacGregor Campbell discovers, their solutions may provide the key to murders or even buried treasure
The capture of the Enigma code machine 70 years ago changed the course of the second world war. But the secret codes broken by this event were not history’s toughest ciphers. Plenty of codes are uncracked and, as MacGregor Campbell discovers, their solutions may provide the key to murders or even buried treasure
MURDER
Somerton Man's poetic mystery

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TREASURE
Beale's buried treasure

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PUZZLE
The MIT time-lock puzzle

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CIA SECRET
Kryptos, a monument to CIA secrecy

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MEDIEVAL MYSTERY
The Voynich manuscript

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MUSICAL MESSAGE
Elgar's unread message

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THE ENIGMA CODE
The second world war's last Enigma

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ZODIAC
Who was the Zodiac killer?

The 1960s serial murderer Zodiac may have told the world his or her identity – but no one has been able to decrypt the message
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