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During WWI, the U. S. Army Signal Corps rotated the inner ring of this cipher disk to encrypt messages in the field quickly.

During WWI, the U.S. Army Signal Corps rotated the inner ring of this cipher disk to encrypt messages in the field quickly.

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Title: During WWI, the U. S. Army Signal Corps rotated the inner ring of this cipher disk to encrypt messages in the field quickly.

Caption: During WWI, the U.S. Army Signal Corps rotated the inner ring of this cipher disk to encrypt messages in the field quickly.

Credit: Album / Universal Images Group / Encyclopaedia Britannica

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Image size: 3825 × 3825 px | 41.9 MB

Print size: 32.4 × 32.4 cm | 1505.9 × 1505.9 in (300 dpi)

Keywords: 1ST WORLD WAR • AMERICAN • AMERICANS • APPLICATION • ARMIES ARMY • ARMIES • ARMY'S • ARMY • AUTOKEY • BREAKING • CIPHER • CIPHERTEXT • CODE-BREAKER • CODE-BREAKING • COMMUNICATIONS • CONCEALED • CONCEALMENT • CORPS • CRYPTOGRAM • CRYPTOGRAPHIC • CRYPTOLOGY • CRYPTOSYSTEM • DECIPHER • DECRYPTION • DIAGRAPHIC • DISC • DISCUS • DISK • EEUU • ENCRYPTING • ENCRYPTION • FIRST WORLD WAR • HIDDEN • HORIZONTAL • I WORLD WAR • ILLUSTRATION • ILLUSTRATIONS • ILUSTRATION • INFORMATION • INTELLIGENCE • KEY • LANGUAGE • MATHEMATICS • MILITAR • MILITARS • MILITARY • PLAINTEXT • RING • SECRET • SIGNAL • SOLVE • SOLVING • SQUARE • SUBSTITUTION • SYSTEM • TABLE • TABLES • TEXT • U S A • U. S. A • U. S. A. • UNITED STATES AMERICA • UNITED STATES OF AMERICA • UNITED STATES • US-AMERICAN • USA • USA. UNITED STATES • VERTICAL LINES • VERTICAL • WORLD WAR 1 • WORLD WAR I (1914-18) • WORLD WAR I • WORLD WAR ONE • WRITING • WWI