Disclosed are a mobile terminal, a base station and a non-transitory computer-readable medium to securely receive a signal. When the mobile terminal sends information, randomly implementing an XNOR calculation is randomly implemented on corresponding digits of a low-frequency digital sequence which is to transmit the information and a first cyclic PN sequence or a second cyclic PN sequence so as to obtain spread sequences. The spread sequences are modulated and sent. The base station or the mobile terminal receives the spread sequence, and despreads the same using the first and second cyclic PN sequences. The present invention effectively prevents lawbreakers from decoding and monitoring a communication process.