Currently communications through mobile devices are necessary, but use of these is restricted due to the presence of attacks on communications. The encrypted authentication and data encryption are techniques to protect against such threats. Among the different types of encryption algorithms that exist, some are unsafe and additionally may require high computational costs, this also causes the communications not to be carried out at the appropriate times and sometimes the session establishing process fails. This paper shows a strategy that allows an analysis of the most common and safe encryption algorithms, specifically Rijndael (Advanced Encryption Standard-AES), SERPENT and TWOFISH, in order to establish which one of these is the most optimum to be implemented in smartphones and tablets; additionally other algorithms are relate, which are used commonly in many applications, tests are carried out over mobiles devices, which measure the performance and computational cost of the devices when they run each algorithm.