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  2. Time-based one-time password - Wikipedia

    en.wikipedia.org/wiki/Time-based_One-Time_Password

    TOTP credentials are also based on a shared secret known to both the client and the server, creating multiple locations from which a secret can be stolen. [4] An attacker with access to this shared secret could generate new, valid TOTP codes at will. This can be a particular problem if the attacker breaches a large authentication database. [5]

  3. Secret Service code name - Wikipedia

    en.wikipedia.org/wiki/Secret_Service_code_name

    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 ...

  4. One-time pad - Wikipedia

    en.wikipedia.org/wiki/One-time_pad

    One-time pad. A format of one-time pad used by the U.S. National Security Agency, code named DIANA. The table on the right is an aid for converting between plaintext and ciphertext using the characters at left as the key. In cryptography, the one-time pad (OTP) is an encryption technique that cannot be cracked, but requires the use of a single ...

  5. Diffie–Hellman key exchange - Wikipedia

    en.wikipedia.org/wiki/Diffie–Hellman_key_exchange

    The Diffie–Hellman key exchange method allows two parties that have no prior knowledge of each other to jointly establish a shared secret key over an insecure channel. This key can then be used to encrypt subsequent communications using a symmetric-key cipher. Diffie–Hellman is used to secure a variety of Internet services.

  6. Enigma machine - Wikipedia

    en.wikipedia.org/wiki/Enigma_machine

    The Enigma machine was considered so secure that it was used to encipher the most top-secret messages. [1] The Enigma has an electromechanical rotor mechanism that scrambles the 26 letters of the alphabet. In typical use, one person enters text on the Enigma's keyboard and another person writes down which of the 26 lights above the keyboard ...

  7. Kryptos - Wikipedia

    en.wikipedia.org/wiki/Kryptos

    Dimensions. 11–12 feet × 20 feet. Location. George Bush Center for Intelligence, Langley, Virginia. Coordinates. 38°57′08″N 77°08′45″W  /  38.95227°N 77.14573°W  / 38.95227; -77.14573. Kryptos is a distributed sculpture by the American artist Jim Sanborn located on the grounds of the Central Intelligence Agency (CIA ...