**Cipher Text**Incompraehensibilis Conseruator.Redemptor optimusIudex omnipotensSapientissimus omnipotensRedemptor fabricatorIudex redemptorOptimus magnusAeternus iudexAuctor omnipotens.
**Decoding**This intriguing cipher was a new challenge for me since i had not come across such a cipher before. Anyway to decoding the cipher text. First i engaged my favorite online crypto solver https://dcode.fr which identified the cipher as a Trithemius ave maria cipher. Using the same site to decode the cipher resulted to an all caps string "*RSTHISISTRITHEMIUS*".However trying the result as the flag led to an incorrect alert. I decided to focus on the hint about the flag being case sensitive. First i tried out modifying different characters to caps to no avail.Some google-fu led me to the polygraphia table. I know you are wondering what that might be. Remember i did'nt explain how the cipher encrypts a secret,here's the trick.The trithemius ave maria maps characters to words in a famous book written by the inventor of the cipher; a german abbot known as Johannes Trithemius.The character to word mapping table is as follows * A-deus, clemens * B-creator, clementissimus * C-conditor, pius * D-opifex, piissimus * E-dominus, magnus * F-dominator, excelsus * G-consolator, maximus * H-arbiter, optimus * I-iudex, sapientissimus * K-illuminator, inuisibilis * L-illustrator, immortalis * M-rector, aeternus * N-rex, sempiternus * O-imperator, gloriosus * P-gubernator, fortissimus * Q-factor, sanctissimus * R-fabricator, incompraehensibilis * S-conseruator, omnipotens * T-redemptor, pacificus * U-auctor, misericors * X-princeps, misericordissimus * Y-pastor, conctipotens * Z-moderator, magnificus.
Therefore mapping our cipher text to the table respecting case sensitivity as in the cipher led us to getting the elusive flag.RS{ThIsIsTrItHeMiUs}.A good challenge that required some out of the box thinking.