A vehicle access method, comprising a preliminary phase including the following steps: a1) provide the vehicle, which can be driven by different users, including a primary user and a secondary user, which is equipped with a keyless entry system, and which stores a master key, a primary key, a secondary key, and a tertiary key; a2) provide a remote data server, which stores server data including identification information of the primary user, an elliptic encryption curve, the master key, the primary key, the secondary key and the tertiary key; a3) provide a first personal device which belongs to the primary user, which includes an application that is configured to connect to the keyless entry system and to the server, and which stores the identification information of the primary user and the elliptic encryption curve; the access method subsequently comprising a data exchange phase including the following successive steps: b1) the application installed on the first personal device sends the identification information of the primary user to the server; b2) the server recognizes the identification information of the primary user; b3) the server generates encrypted server data (KEC) using the elliptic encryption curve for the encryption, the encrypted server data (KEC) including the secondary key, the tertiary key, and an encrypted master key (K1) using the primary key for the encryption; b4) the server sends the encrypted server data (KEC) to the first personal device; b5) the first personal device uses the elliptic encryption curve to decrypt the encrypted server data (KEC), such that the first personal device stores the secondary key, the tertiary key, and the encrypted master key (K1); the access method subsequently comprising an access phase including the following successive steps: c1) the application installed on the first personal device establishes a secure connection with the vehicle, implementing the tertiary key; c2) if the secure connection procedure is successful, the application installed on the first personal device transmits the encrypted master key (K1) to the vehicle; c3) the vehicle uses the primary key to decrypt the encrypted master key (K1); c4) after decryption, the vehicle recognizes the master key and controls the keyless entry system, such that the primary user can access the vehicle using the application installed on the first personal device. a1) provide the vehicle, which can be driven by different users, including a primary user and a secondary user, which is equipped with a keyless entry system, and which stores a master key, a primary key, a secondary key, and a tertiary key; a2) provide a remote data server, which stores server data including identification information of the primary user, an elliptic encryption curve, the master key, the primary key, the secondary key and the tertiary key; a3) provide a first personal device which belongs to the primary user, which includes an application that is configured to connect to the keyless entry system and to the server, and which stores the identification information of the primary user and the elliptic encryption curve; b1) the application installed on the first personal device sends the identification information of the primary user to the server; b2) the server recognizes the identification information of the primary user; b3) the server generates encrypted server data (KEC) using the elliptic encryption curve for the encryption, the encrypted server data (KEC) including the secondary key, the tertiary key, and an encrypted master key (K1) using the primary key for the encryption; b4) the server sends the encrypted server data (KEC) to the first personal device; b5) the first personal device uses the elliptic encryption curve to decrypt the encrypted server data (KEC), such that the first personal device stores the secondary key, the tertiary key, and the encrypted master key (K1); c1) the application installed on the first personal device establishes a secure connection with the vehicle, implementing the tertiary key; c2) if the secure connection procedure is successful, the application installed on the first personal device transmits the encrypted master key (K1) to the vehicle; c3) the vehicle uses the primary key to decrypt the encrypted master key (K1); c4) after decryption, the vehicle recognizes the master key and controls the keyless entry system, such that the primary user can access the vehicle using the application installed on the first personal device.