Abstract: There is provided a method of communicating vehicle data for vehicle control. The method includes (a) generating a multicast key and transmitting it to the vehicle in a multicast manner, (b) obtaining a hash key and an encryption key based on the multicast key and unique identification information of the vehicle, and (c) obtaining vehicle data by signal processing and combining first to n-th partition data of the vehicle data transmitted from the vehicle (“n” is an integer equal to or greater than 2). The i-th partition data includes i-th serial number information, an i-th MAC chaining value, i-th payload information, and an i-th MAC tag (“i” is an integer from 1 to n). The method further includes (c-1) receiving the i-th partition data, (c-2) authenticating the i-th partition data, and (c-3) decrypting the i-th payload information using the encryption key when the i-th partition data is authenticated.

Abstract: There is provided a device for transmitting a push-to-talk message. The device includes a communication interface, and an operation processor that transmits a first segment group of the PTT message among segments of the PTT message to first to n-th PTT devices through the communication interface; transmits a heartbeat signal to the first to n-th PTT devices through the communication interface; receives an i-th response signal to the heartbeat signal from an i-th PTT device through the communication interface; allocates, based on the i-th response signal, the i-th PTT device to a first group to which a second segment group of the PTT message is transmitted without any conversion or a second group to which data obtained by converting the second segment group is transmitted; and transmits the second segment group to the first group and the data to the second group through the communication interface.

Abstract: According to one aspect of the technique of the present disclosure, there is provided a method for securely communicating data. The method includes: (a) establishing a first encryption scheme, a data integrity checking scheme, an encryption key and an authentication key through a communication connection with a receiver; (b) generating a random key; (c) generating secure data including random key information obtained by encrypting the random key using the encryption key and the first encryption scheme; authentication information generated based on the random key, the data integrity checking scheme and the authentication key; and data information obtained by encrypting data using the random key and a second encryption scheme whose operation load is lower than that of the first encryption scheme; and (d) transmitting the secure data to the receiver.

Abstract: A method for receiving firmware including pieces of firmware data is provided. The method is performed by a first apparatus in a multicast group including at least the first apparatus and a second apparatus. The method includes (a) receiving first meta-information for the firmware data from the second apparatus, (b) generating, based on the first meta-information, second meta-information for at least one piece of firmware data to be used to apply the firmware to the first apparatus, among the firmware data, and (c) receiving, based on the second meta-information, the at least one piece of firmware data from a firmware providing apparatus or the second apparatus. The first meta-information includes at least history information including version and partitioning information for each of the pieces of firmware data, and the second meta-information includes at least the history information for each of the at least one piece of firmware data.

Abstract: A method includes (a) receiving i-th data among first to n-th data transmitted in a multicast manner from a firmware providing apparatus, (b) acquiring partitioning information thereof, a MAC chaining value, length information, i-th firmware data, and MAC from the i-th data, (c) authenticating the MAC chaining value of the i-th firmware data, the length information, and the i-th firmware data by comparing a MAC of the i-th firmware data with a value computed by a first MAC generation algorithm, which uses the MAC chaining value of the i-th firmware data, the length information, and the i-th firmware data as a relevant input; (d) authenticating the order of the i-th firmware data by using the MAC chaining value of the i-th firmware data and a second MAC generation algorithm; and (e) obtaining the firmware by combining a first to an n-th firmware data obtained by executing (a) to (d).

Abstract: According to one aspect of the technique of the present disclosure, there is provided a device in a network including: a storage in a secure zone to store encryption algorithms, information generators, and keys; and an operation processor in the secure zone. When the device operates as a master device, the operation processor selects at least one of an encryption algorithm, an information generator or a key used for encrypted communication within the network, generates profile information including at least one of identification information of the encryption algorithm, the information generator or the key, and transmits the profile information to another device in the network. When the device does not operate as the master device, the operation processor receives the profile information from the master device, and designates based thereon at least one of the encryption algorithm, the information generator or the key used for the encrypted communication.