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  2. American Morse code - Wikipedia

    en.wikipedia.org/wiki/American_Morse_code

    1911 Chart of the Standard American Morse Characters. American Morse Code — also known as Railroad Morse—is the latter-day name for the original version of the Morse Code developed in the mid-1840s, by Samuel Morse and Alfred Vail for their electric telegraph.

  3. Copiale cipher - Wikipedia

    en.wikipedia.org/wiki/Copiale_cipher

    The Copiale cipher is an encrypted manuscript consisting of 75,000 handwritten characters filling 105 pages in a bound volume. [1] Undeciphered for more than 260 years, the document was decrypted in 2011 with computer assistance.

  4. Rosetta Stone - Wikipedia

    en.wikipedia.org/wiki/Rosetta_Stone

    Study of the decree was already underway when the first complete translation of the Greek text was published in 1803. Jean-François Champollion announced the transliteration of the Egyptian scripts in Paris in 1822; it took longer still before scholars were able to read Ancient Egyptian inscriptions and literature confidently. Major advances ...

  5. Konami Code - Wikipedia

    en.wikipedia.org/wiki/Konami_Code

    The code is also known as the "Contra Code" and "30 Lives Code", since the code provided the player 30 extra lives in Contra. The code has been used to help novice players progress through the game. [10] [12] The Konami Code was created by Kazuhisa Hashimoto, who was developing the home port of the 1985 arcade game Gradius for the NES.

  6. Classified information in the United States - Wikipedia

    en.wikipedia.org/wiki/Classified_information_in...

    Top Secret is the highest level of classification. However some information is further categorized/marked by adding a code word so that only those who have been cleared for each code word can see it. A document marked SECRET (CODE WORD) could be viewed only by a person with a secret or top secret clearance and that specific code word clearance.

  7. Cicada 3301 - Wikipedia

    en.wikipedia.org/wiki/Cicada_3301

    The stated purpose of the puzzles each year was to recruit "highly intelligent individuals", although the ultimate purpose remains unknown. [2] Theories have included claims that Cicada 3301 is a secret society with the goal of improving cryptography, privacy, and anonymity or that it is a cult or religion.

  8. Classified information - Wikipedia

    en.wikipedia.org/wiki/Classified_information

    Top Secret is the highest level of classified information. [4] Information is further compartmented so that specific access using a code word after top secret is a legal way to hide collective and important information. [5] Such material would cause "exceptionally grave damage" to national security if made publicly available. [6]

  9. 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.