The present invention is enclosed in the area of local access and validation, specifically by means of wireless systems. It is an object of the present invention an apparatus (1) for secure local access and validation with a mobile device (10), comprising wireless communication means and proximity detection means, and configured to issue a wireless beacon (S1) comprising an identification, detect a first proximity value (S2a) and a second proximity value (S2b) of said mobile device (10), such second value on receipt of an at least one wireless message issued by the mobile device (10), and being further configured to, based on said first proximity value and second proximity value, determine a detected proximity (S3) and cause an action to initiate (S4) based on such detected proximity. Such apparatus (1) provides for secure and simplified identification of a mobile device (10), for access purposes. A system comprising such apparatus (1) and a mobile device (10), and an associated method are also part of the present invention.