An electronic device includes: a non-volatile memory configured to store data including encrypted data; and a digital circuit. The digital circuit includes: a microprocessor configured to access the non-volatile memory and an internal memory; and a decryption circuit arranged on an interconnect network identifying an internal data path for exchanging the data between the non-volatile memory and the microprocessor, and connected to a memory controller of the non-volatile memory for receiving blocks of data from the non-volatile memory, the decryption circuit being configured to: perform a decryption on the fly of blocks of the data read from the non-volatile memory to obtain read decrypted data; generate first decryption masks corresponding to first blocks of data being read from the non-volatile memory at a given read address; and generate second decryption masks corresponding to second blocks of data to be read from the non-volatile memory at a next estimated read address.