decipher

verb

1. (transitive)To convert a code or cipher to plain text.
2. (transitive)To read text that is almost illegible or obscure.
3. (transitive)To make sense of a complex situation.

   “Truly, we need human infirmity to teach us human nature, and that to Louis had been as a sealed book; he had only seen the coloured and gilded outside: too late he had to decipher the rough and gloomy page within.”

4. (transitive)To find a solution to a problem.

noun

1. A decipherment; a decoding.

   “I enclose a letter which I received yesterday evening from the Marques de Monsalud, containing the decipher of a letter from the King to the Comte d'Erlon. I wish that the Marques had sent the ciphered letter here […]”