The foundation of Matrix Encryption is a discrete function called the Modified Combinatorial Batch Decimation Function (CBDF-Mod) and its asymmetric inverse (CBDI-Mod). Herein we disclose the nature of Matrix Encryption, an encryption technology built upon these two discrete functions, together with their shared, Secondary Variable Functions. Matrix Encryption implements a block encryption with arbitrary block size dependent upon the length of text to be encrypted, thereby allowing for keys of user desired length and for the surpassing of industry standards of security. A Master Key may be used to generate a Key Set containing keys of appropriate length for any data presented above a minimum length, up to a length corresponding to the length of a message for which the Master Key is appropriate. Matrix Encryption reads and writes numerically encrypted text to text files as designated by the user.