Secrets And Ciphers

Clues in this puzzle

Across

• A covering used to disguise or conceal one's true identity. (4)
• A small sign or mark left behind by someone or something. (5)

Down

• A place sheltered from direct light. (5)
• The essential piece of information required to decipher an encrypted message. (3)

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• The Cryptic Collection Easy · 4 words

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