The cryptography arises in the technological and communication media as part of the
reality of our students, however, some of the students still do not know this. In this way,
establishing a connection between the cryptography contained in this context and the
content seen in the classroom can generate positive results in the school environment.
With this in mind, the purpose of this work is to present the cryptography as a tool to
contextualize the content of functions, in particular, the affine functions. With the intention
of enriching the teaching of Mathematics and awakening in the student the interest in
Mathematics, the cryptography was added to the content of the functions affine to the 9th
year of Elementary School. Relating the teaching of functions to cryptography is a way of
informing him that everything he has studied up to then, however basic, is applicable and
useful, in this essential case, to the safe development of technology. For the development
of the work, a strategy was established with the students, started with a pre-test with the
objective of verifying their knowledge in relation to the topic addressed; Then, historical
aspects of cryptography and functions were raised, and finally, the connection between the
two themes was made, totaling 6 (six) encounters. Data were collected through pre-test,
post-test and responses to activities. In addition, a bibliographic study was carried out,
which gives the research a qualitative character and aims to facilitate the understanding of
the content of the affine functions, through the contextualization provided by the relation
established between the cryptography and the functions.
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