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  2. WhatsApp's new 'secret codes' add an extra layer of privacy ...

    techcrunch.com/2023/11/30/whatsapps-new-secret...

    WhatsApp is rolling out a new “secret codes” feature that adds another layer of privacy to your locked conversations on the messaging platform. The app launched locked chats earlier this year...

  3. Secret Service code name - Wikipedia

    en.wikipedia.org/wiki/Secret_Service_code_name

    President John F. Kennedy, codename "Lancer" with First Lady Jacqueline Kennedy, codename "Lace". The United States Secret Service uses code names for U.S. presidents, first ladies, and other prominent persons and locations. [1] The use of such names was originally for security purposes and dates to a time when sensitive electronic ...

  4. Classified information in the United States - Wikipedia

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

    The United States has three levels of classification: Confidential, Secret, and Top Secret. Each level of classification indicates an increasing degree of sensitivity. Thus, if one holds a Top Secret security clearance, one is allowed to handle information up to the level of Top Secret, including Secret and Confidential information. If one ...

  5. Code (cryptography) - Wikipedia

    en.wikipedia.org/wiki/Code_(cryptography)

    Code (cryptography) A portion of the "Zimmermann Telegram" as decrypted by British Naval Intelligence codebreakers. The word Arizona was not in the German codebook and had therefore to be split into phonetic syllables. Partially burnt pages from a World War II Soviet KGB two-part codebook. In cryptology, a code is a method used to encrypt a ...

  6. Caesar cipher - Wikipedia

    en.wikipedia.org/wiki/Caesar_cipher

    In cryptography, a Caesar cipher, also known as Caesar's cipher, the shift cipher, Caesar's code, or Caesar shift, is one of the simplest and most widely known encryption techniques. It is a type of substitution cipher in which each letter in the plaintext is replaced by a letter some fixed number of positions down the alphabet.

    • List of HTTP status codes - Wikipedia
      List of HTTP status codes - Wikipedia
      wikipedia.org
  7. Pigpen cipher - Wikipedia

    en.wikipedia.org/wiki/Pigpen_cipher

    The pigpen cipher (alternatively referred to as the masonic cipher, Freemason's cipher, Rosicrucian cipher, Napoleon cipher, and tic-tac-toe cipher) [2] [3] is a geometric simple substitution cipher, which exchanges letters for symbols which are fragments of a grid. The example key shows one way the letters can be assigned to the grid.

  8. The Secret Code (Seinfeld) - Wikipedia

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

    "The Secret Code" is the 117th episode of NBC sitcom Seinfeld. This was the seventh episode of the seventh season. It aired on November 9, 1995. In this episode, George is unwilling to share his ATM code with his fiancée Susan, and finds himself entrapped

  9. Capture the flag (cybersecurity) - Wikipedia

    en.wikipedia.org/wiki/Capture_the_flag_(cyber...

    Capture the Flag (CTF) in computer security is an exercise in which participants attempt to find text strings, called "flags", which are secretly hidden in purposefully-vulnerable programs or websites. They can be used for both competitive or educational purposes.

  10. History of cryptography - Wikipedia

    en.wikipedia.org/wiki/History_of_cryptography

    Cryptography, the use of codes and ciphers to protect secrets, began thousands of years ago. Until recent decades, it has been the story of what might be called classical cryptography — that is, of methods of encryption that use pen and paper, or perhaps simple mechanical aids.

  11. Card security code - Wikipedia

    en.wikipedia.org/wiki/Card_security_code

    A card security code (CSC; also known as CVC, CVV, or several other names) is a series of numbers that, in addition to the bank card number, is printed (not embossed) on a credit or debit card. The CSC is used as a security feature for card not present transactions , where a personal identification number (PIN) cannot be manually entered by the ...