Abstract: An invention in the field of information society for making data and information inaccessible to unauthorized persons in order to protect the privacy of data and information during electronic transmission using a cryptographic method for reliable, fast and secure encryption widely used in industry (private and public telecommunications sectors, computing, national defense, computer programs, electronic payment transactions and banking operations, cryptography of musical and audiovisual works and digital signatures and certificates) by means of the use of the following technical means in sequential and successive order: 1. an alphanumeric matrix, 2. a numerical remainder base matrix, 3. an equivalence key, 4. an equivalence table, 5. a reduced remainder or template cryptogram, 6. a protocol key, 7. a coding algorithm, 8. a final remainder cryptogram and 9. a decoding algorithm.