  Since their introduction, Brauer configuration algebras (BCAs) and their
specialized messages have helped research in several fields of mathematics and
sciences. This paper deals with a new perspective on using such algebras as a
theoretical framework in classical cryptography and music theory. It is proved
that some block cyphers define labeled Brauer configuration algebras.
Particularly, the dimension of the BCA associated with a ciphertext-only attack
of the Vigenere cryptosystem is given by the corresponding key's length and the
captured ciphertext's coincidence index. On the other hand, historically,
Bach's canons have been considered solved music puzzles. However, due to how
Bach posed such canons, the question remains whether their solutions are only
limited to musical issues. This paper gives alternative solutions based on the
theory of Brauer configuration algebras to some of the puzzle canons proposed
by Bach in his Musical Offering (BWV 1079) and the canon \^a 4 Voc: Perpetuus
(BWV 1073). Specifically to the canon \^a 6 Voc (BWV 1076), canon 1 \^a2 (also
known as the crab canon), and canon \^a4 Quaerendo Invenietis. These solutions
are obtained by interpreting such canons as ciphertexts (via route and
transposition cyphers) of some specialized Brauer messages. In particular, it
is noted that the structure or form of the notes used in such canons can be
described via the shape of the most used symbols in Bach's works.
