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  2. Secret decoder ring - Wikipedia

    en.wikipedia.org/wiki/Secret_decoder_ring

    A secret decoder ring (or secret decoder) is a device that allows one to decode a simple substitution cipher—or to encrypt a message by working in the opposite direction. [ 1 ] As inexpensive toys, secret decoders have often been used as promotional items by retailers, as well as radio and television programs, from the 1930s through to the ...

  3. Printer tracking dots - Wikipedia

    en.wikipedia.org/wiki/Printer_tracking_dots

    Yellow dots on white paper, produced by color laser printer (enlarged, dot diameter about 0.1 mm) Printer tracking dots, also known as printer steganography, DocuColor tracking dots, yellow dots, secret dots, or a machine identification code (MIC), is a digital watermark which many color laser printers and photocopiers produce on every printed page that identifies the specific device that was ...

  4. Kryptos - Wikipedia

    en.wikipedia.org/wiki/Kryptos

    The dust jacket of the US version of Dan Brown's 2003 novel The Da Vinci Code contains two references to Kryptos—one on the back cover (coordinates printed light red on dark red, vertically next to the blurbs) is a reference to the coordinates mentioned in the plaintext of passage 2, except the degree digit is off by one. When Brown and his ...

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    mail.aol.com

    Get AOL Mail for FREE! Manage your email like never before with travel, photo & document views. Personalize your inbox with themes & tabs. You've Got Mail!

  6. Controlled Cryptographic Item - Wikipedia

    en.wikipedia.org/wiki/Controlled_Cryptographic_Item

    Controlled Cryptographic Item (CCI) is a U.S. National Security Agency term for secure telecommunications or information handling equipment, associated cryptographic component or other hardware item which performs a critical communications security (COMSEC) function.

  7. The Secret Code (serial) - Wikipedia

    en.wikipedia.org/wiki/The_Secret_Code_(serial)

    The Secret Code (1942) was the 19th serial released by Columbia Pictures. It features the masked hero "The Black Commando" facing Nazi saboteurs, inspired by Republic Pictures' successful Spy Smasher serial of the same year. The chapters of this serial each ended with a brief tutorial in cryptography.

  8. Millimeter wave scanner - Wikipedia

    en.wikipedia.org/wiki/Millimeter_wave_scanner

    A millimeter wave scanner is a whole-body imaging device used for detecting objects concealed underneath a person’s clothing using a form of electromagnetic radiation. Typical uses for this technology include detection of items for commercial loss prevention , smuggling , and screening for weapons at government buildings and airport security ...

  9. World War I cryptography - Wikipedia

    en.wikipedia.org/wiki/World_War_I_cryptography

    The Germans had specific regulations regarding which kinds of codes and ciphers could be used under given circumstances. Within three kilometers of the front lines, known as the danger zone, all communications were required to be in a code known as the three-number code. This was the only code or cipher permitted.

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