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English: Vernam cipher patent, Figure 1. This drawing shows Gilbert Vernam's original concept for a teletype encryption machine that combines plaintext characters (C) with characters on a key paper tape (D) using an XOR function. The XOR takes place at relays 19 through 25. If both the C and D contacts are open, no voltage is applied to the relay coil. If both C and D contacts are closed, voltage is applied to both ends of the relay coil, so the relay contacts stay open. If just one of contacts C and D are closed, current flows through the relay coil, closing its contact.
Источник US patent US1310719A ([[{{{y}}}-{{{m}}}-{{{d}}}]]) S. Verman Secret Signaling System
Автор S. Verman

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A portion of the disclosure of this patent document contains material which is subject to (copyright or mask work) protection. The (copyright or mask work) owner has no objection to the facsimile reproduction by any­one of the patent document or the patent disclosure, as it appears in the Patent and Trademark Office patent file or records, but otherwise reserves all (copyright or mask work) rights whatsoever.

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2004-11-23 15:27 443×634× (59281 bytes) ArnoldReinhold Vernam cipher patent, Figure 1

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