HOW TO SOLVE 3 HILL CHIPER USING MODULAR 29

Question

QJKGMXYJZMSXSG.TNRXOSWCYT.NHRIYH,YJZRYLXRRAPTXI CVYKSUMRA

Answer 1

To use a Hill cipher we need a key which is a square matrix. Since this is alphabetic the modulo should be 26 not 29 since there are only 26 letteers in the English alphabet. a 3×3 matrix would be required to decrypt 3-letter codes. The problem doesn't seem to contain a Hill cipher key matrix, since the codes have different lengths (14, 10 and 7).