Abstract: A management site (10) generates an encrypted message by a public-key symmetrical encryption algorithm, the algorithm and the key being selected by the management site among a memorized list. The message (DKE), which includes an identifier of the encryption algorithm and key used, is transmitted to a portable device (16), which stores it. For the use, the message is transmitted to a secured module (20) that decrypts it, checks its compliance with an internal reference, and generates a digital accreditation controlling the unlocking of a lock device (18). The decryption is operated with the algorithm and the key recognized based on the identifiers of the message, selected among a list memorized by the secured module.

Abstract: The method includes the steps of: a) generating by an application software (SWA) a message forming a key (DKE) comprising an encrypted data field containing a time-stamping or sequencing time marker; b) transferring the message to a portable communication device (CD), held by a user; c) transmitting the message, by short-range transmission, from the communication device to a reading interface (ERED) coupled to a lock device (LOCK); d) analyzing the message by decrypting the data field and checking the consistency of the time marker with an inner clock of the interface or with a sequence number memorized in the interface; and e) in case of compliant message, sending from the interface to the lock device a digital accreditation (OPEN) stored in memory in the interface and to operate the lock device unlocking upon recognizing the compliance of said digital accreditation.

Abstract: A management site (10) generates an encrypted message by a public-key symmetrical encryption algorithm, the algorithm and the key being selected by the management site among a memorized list. The message (DKE), which includes an identifier of the encryption algorithm and key used, is transmitted to a portable device (16), which stores it. For the use, the message is transmitted to a secured module (20) that decrypts it, checks its compliance with an internal reference, and generates a digital accreditation controlling the unlocking of a lock device (18). The decryption is operated with the algorithm and the key recognized based on the identifiers of the message, selected among a list memorized by the secured module.

Abstract: The method consists in: a) generating by an application software (SWA) a message forming a key (DKE) comprising an encrypted data field containing a time-stamping or sequencing time marker; b) transferring the message to a portable communication device (CD), held by a user; c) transmitting the message, by short-range transmission, from the communication device to a reading interface (ERED) coupled to a lock device (LOCK); d) analyzing the message by decrypting the data field and checking the consistency of the time marker with an inner clock of the interface or with a sequence number memorized in the interface; and e) in case of compliant message, sending from the interface to the lock device a digital accreditation (OPEN) stored in memory in the interface and to operate the lock device unlocking upon recognizing the compliance of said digital accreditation.