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  2. Kerckhoffs's principle - Wikipedia

    en.wikipedia.org/wiki/Kerckhoffs's_principle

    The system was considered "indecipherable" because tables and keys do not convey meaning by themselves. Secret messages can be compromised only if a matching set of table, key, and message falls into enemy hands in a relevant time frame. Kerckhoffs viewed tactical messages as only having a few hours of relevance.

  3. Vigenère cipher - Wikipedia

    en.wikipedia.org/wiki/Vigenère_cipher

    This earned it the description le chiffrage indéchiffrable (French for 'the indecipherable cipher'). Many people have tried to implement encryption schemes that are essentially Vigenère ciphers. [3] In 1863, Friedrich Kasiski was the first to publish a general method of deciphering Vigenère ciphers.

  4. Unpaired word - Wikipedia

    en.wikipedia.org/wiki/Unpaired_word

    An unpaired word is one that, according to the usual rules of the language, would appear to have a related word but does not. [1] Such words usually have a prefix or suffix that would imply that there is an antonym, with the prefix or suffix being absent or opposite.

  5. Cipher - Wikipedia

    en.wikipedia.org/wiki/Cipher

    Edward Larsson's rune cipher resembling that found on the Kensington Runestone.Also includes runically unrelated blackletter writing style and pigpen cipher.. In cryptography, a cipher (or cypher) is an algorithm for performing encryption or decryption—a series of well-defined steps that can be followed as a procedure.

  6. Opposite - Wikipedia

    en.wikipedia.org/wiki/Antonym

    An antonym is one of a pair of words with opposite meanings. Each word in the pair is the antithesis of the other. A word may have more than one antonym. There are three categories of antonyms identified by the nature of the relationship between the opposed meanings.

  7. Undeciphered writing systems - Wikipedia

    en.wikipedia.org/wiki/Undeciphered_writing_systems

    Seals showing Indus script, an ancient undeciphered writing system Page 32 of the Voynich manuscript, a medieval manuscript written with an undeciphered writing system. Many undeciphered writing systems exist today; most date back several thousand years, although some more modern examples do exist.

  8. Converse (semantics) - Wikipedia

    en.wikipedia.org/wiki/Converse_(semantics)

    In linguistics, converses or relational antonyms are pairs of words that refer to a relationship from opposite points of view, such as parent/child or borrow/lend. [ 1 ] [ 2 ] The relationship between such words is called a converse relation . [ 2 ]

  9. Contronym - Wikipedia

    en.wikipedia.org/wiki/Contronym

    Hindi: कल and Urdu: کل (kal) may mean either "yesterday" or "tomorrow" (disambiguated by the verb in the sentence).; Icelandic: fram eftir can mean "toward the sea" or "away from the sea" depending on dialect.