codeword

1. A string representing an encoded piece of text.

   Bob cannot get any information out of the codeword since he doesn't know what transmission bases Alice used.

2. A word or phrase (or by extension a concept) used to make a (concealed) reference to another word or concept.

3. A type of crossword puzzle where the letters of the alphabet are represented by numbers and the solver must identify them by their position and frequency.

правильный