A method for tracing data related to an equipment user's activity, said equipment being connected to a network, said equipment comprising an interface enabling at least one user to log in and enabling to execute a set of user applications, the method comprising: • a first step of authenticating (AUTH) a user connecting to the equipment, this step comprising: ∘ authenticating a user to the equipment; ∘ generating a first random code by a first cryptographic function; ∘ creating at least one first encrypted volume backed up in a memory of the equipment, the encryption of the data on the first encrypted volume being made from the first random code; ∘ creating a first set of redirection links for designating access parts for each application of records of soft data on the first encrypted volume; • second step of starting at least one application of the equipment comprising: ∘ generating a second code from a second cryptographic function, the second code being a function of a user authentication datum; ∘ creating a second encrypted volume in a memory of the equipment, the data stored in said second volume being persistent data comprising a first set of data coming from an external devise (SERV 1), the encryption of the data stored on the second volume being made at least from the second code; ∘ creating a second set of redirection link for designating access paths for each application of records of persistent data on the second encrypted volume. • a first step of authenticating (AUTH) a user connecting to the equipment, this step comprising: ∘ authenticating a user to the equipment; ∘ generating a first random code by a first cryptographic function; ∘ creating at least one first encrypted volume backed up in a memory of the equipment, the encryption of the data on the first encrypted volume being made from the first random code; ∘ creating a first set of redirection links for designating access parts for each application of records of soft data on the first encrypted volume; ∘ authenticating a user to the equipment; ∘ generating a first random code by a first cryptographic function; ∘ creating at least one first encrypted volume backed up in a memory of the equipment, the encryption of the data on the first encrypted volume being made from the first random code; ∘ creating a first set of redirection links for designating access parts for each application of records of soft data on the first encrypted volume; • second step of starting at least one application of the equipment comprising: ∘ generating a second code from a second cryptographic function, the second code being a function of a user authentication datum; ∘ creating a second encrypted volume in a memory of the equipment, the data stored in said second volume being persistent data comprising a first set of data coming from an external devise (SERV 1), the encryption of the data stored on the second volume being made at least from the second code; ∘ creating a second set of redirection link for designating access paths for each application of records of persistent data on the second encrypted volume. ∘ generating a second code from a second cryptographic function, the second code being a function of a user authentication datum; ∘ creating a second encrypted volume in a memory of the equipment, the data stored in said second volume being persistent data comprising a first set of data coming from an external devise (SERV 1), the encryption of the data stored on the second volume being made at least from the second code; ∘ creating a second set of redirection link for designating access paths for each application of records of persistent data on the second encrypted volume.