An elementary method for the fidel codification of texts written in Romanian language (O metod\u{a} elementar\u{a} pentru codificarea fidel\u{a} a textelor scrise \^in limba rom\^an\u{a})

In this paper an elementary (cryptographic system) for the codification and decodification of texts written in Romanian language is presented. This method is based on the alphabet A and the 7x7-Square. The theme presented is at the interference between mathematics, Romanian language and cryptography.