Local maintenance monitoring unit intended to be installed near an item of equipment, in order to make it possible to validate a task onto said item of equipment, said local unit being adapted for allowing a capture, storage, transmission or supply of data relating to a task that is carried out by a maintenance technician assigned to the equipment, and comprising: - a processor; - a clock internal to said local maintenance monitoring unit; - display means, controlled by the processor and adapted for making data content available to a portable communication terminal of the maintenance technician, said terminal being external to the local maintenance monitoring unit; and - data transmission means, controlled by the processor and adapted for transmitting a value to an external server via a communication network external to the local maintenance monitoring unit; characterized in that the local maintenance monitoring unit also comprises: - a random number generator, which is internal to said local maintenance monitoring unit, and adapted for producing a fresh check-value randomly or pseudo-randomly upon each operation of the random number generator; and - a memory, arranged in order to store a value in combination with a timestamp obtained from the clock; wherein the processor is adapted for controlling execution of the following sequence of steps: /i/ controlling a fresh operation of the random number generator; /ii/ controlling an update of the memory by writing to said memory the fresh check-value produced by the fresh operation of the random number generator, in combination with a timestamp of said fresh operation of the random number generator; /iii/ controlling the data transmission means to transmit the fresh check-value to the external server, together with an identifier of the local maintenance monitoring unit; /iv/ encrypting the timestamp of the fresh operation of the random number generator; /v/ including in the data content, the fresh check-value, the encrypted timestamp, the identifier of the local maintenance monitoring unit, and possibly additional data; then /vi/ controlling the display means to make the data content as resulting from step /v/ available to the terminal of the maintenance technician. - a processor; - a clock internal to said local maintenance monitoring unit; - display means, controlled by the processor and adapted for making data content available to a portable communication terminal of the maintenance technician, said terminal being external to the local maintenance monitoring unit; and - data transmission means, controlled by the processor and adapted for transmitting a value to an external server via a communication network external to the local maintenance monitoring unit; - a random number generator, which is internal to said local maintenance monitoring unit, and adapted for producing a fresh check-value randomly or pseudo-randomly upon each operation of the random number generator; and - a memory, arranged in order to store a value in combination with a timestamp obtained from the clock; /i/ controlling a fresh operation of the random number generator; /ii/ controlling an update of the memory by writing to said memory the fresh check-value produced by the fresh operation of the random number generator, in combination with a timestamp of said fresh operation of the random number generator; /iii/ controlling the data transmission means to transmit the fresh check-value to the external server, together with an identifier of the local maintenance monitoring unit; /iv/ encrypting the timestamp of the fresh operation of the random number generator; /v/ including in the data content, the fresh check-value, the encrypted timestamp, the identifier of the local maintenance monitoring unit, and possibly additional data; then /vi/ controlling the display means to make the data content as resulting from step /v/ available to the terminal of the maintenance technician.