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  2. Steganography - Wikipedia

    en.wikipedia.org/wiki/Steganography

    The same image viewed by white, blue, green, and red lights reveals different hidden numbers. Steganography (/ ˌ s t ɛ ɡ ə ˈ n ɒ ɡ r ə f i / ⓘ STEG-ə-NOG-rə-fee) is the practice of representing information within another message or physical object, in such a manner that the presence of the concealed information would not be evident to an unsuspecting person's examination.

  3. Mastermind (board game) - Wikipedia

    en.wikipedia.org/wiki/Mastermind_(board_game)

    Mastermind (board game) Mastermind. (board game) Mastermind or Master Mind ( Hebrew: בול פגיעה, romanized : bul pgi'a) is a code -breaking game for two players invented in Israel. [ 1][ 2] It resembles an earlier pencil and paper game called Bulls and Cows that may date back a century.

  4. Visual cryptography - Wikipedia

    en.wikipedia.org/wiki/Visual_cryptography

    Visual cryptography is a cryptographic technique which allows visual information (pictures, text, etc.) to be encrypted in such a way that the decrypted information appears as a visual image. One of the best-known techniques has been credited to Moni Naor and Adi Shamir, who developed it in 1994. [1] They demonstrated a visual secret sharing ...

  5. AOL Mail

    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. Barcode - Wikipedia

    en.wikipedia.org/wiki/Barcode

    Color Construct Code: Color Construct Code is one of the few code symbologies designed to take advantage of multiple colors. [54] [55] Cronto Visual Cryptogram The Cronto Visual Cryptogram (also called photoTAN) is a specialized color barcode, spun out from research at the University of Cambridge by Igor Drokov, Steven Murdoch, and Elena ...

  7. Kryptos - Wikipedia

    en.wikipedia.org/wiki/Kryptos

    Kryptos is a distributed sculpture by the American artist Jim Sanborn located on the grounds of the Central Intelligence Agency (CIA) headquarters, the George Bush Center for Intelligence in Langley, Virginia. [ 1] Since its dedication on November 3, 1990, there has been much speculation about the meaning of the four encrypted messages it bears.

  8. High Capacity Color Barcode - Wikipedia

    en.wikipedia.org/wiki/High_Capacity_Color_Barcode

    High Capacity Color Barcode ( HCCB) is a technology developed by Microsoft for encoding data in a 2D "barcode" using clusters of colored triangles instead of the square pixels conventionally associated with 2D barcodes or QR codes. [ 1] Data density is increased by using a palette of 4 or 8 colors for the triangles, although HCCB also permits ...

  9. Leet - Wikipedia

    en.wikipedia.org/wiki/Leet

    Leet. Leet (or " 1337 "), also known as eleet or leetspeak, or simply hacker speech, is a system of modified spellings used primarily on the Internet. It often uses character replacements in ways that play on the similarity of their glyphs via reflection or other resemblance.