Methods and devices for pre-generating session keys for securing transactions are provided. A plurality of session cryptographic keys are generated from a master cryptographic key and a respective plurality of possible values of a transaction counter. The session cryptographic keys are encrypted to provide a plurality of encrypted session cryptographic keys, which are stored in the user terminal. The master cryptographic key is deleted from the user terminal after the session keys are generated. To secure a transaction, a cryptogram is generated based on one of the encrypted session cryptographic keys and transaction data for the transaction, and the cryptogram is transmitted to a transaction terminal. The transaction counter is updated, and the encrypted session cryptographic key is deleted from the user terminal.

Method, network element, user equipment (UE) and system are disclosed for securing device-to-device (D2D) communication in a wireless network. The wireless network has a first UE in an idle mode, a second UE in a connected mode, and a network element. The method comprises: encrypting the second UE's identification (ID) by using a first key which is known to the network element and the first UE and which is unknown to the second UE; sending the encrypted second UE's ID from the network element to the first UE via the second UE; and verifying the second UE's ID by using the encrypted second UE's ID. According to some embodiments, the method further comprises: deriving a D2D key for D2D communication between the first and second UEs, based on a random number and a second key which is known to the network element and the first UE; encrypting the D2D key based at least in part on a third key which is shared between the network element and the second UE and which is unknown to any other UE in the wireless network; and sending the encrypted D2D key from the network element to the second UE.

The disclosure relates to methods for establishing a secure communication link between a mobile station and a secondary base station in a mobile communication system. The disclosure is also providing mobile communication system for performing these methods, and computer readable media the instructions of which cause the mobile communication system to perform the methods described herein. Specifically, the disclosure suggests that in response to the detected or signaled potential security breach, the master base station increments a freshness counter for re-initializing the communication between the mobile station and the secondary base station; and the mobile station and the secondary base station re-initialize the communication there between. The re-initialization is performed under the control of the master base station and further includes deriving a same security key based on said incremented freshness counter, and establishing the secure communication link utilizing the same, derived security key.

A method in a User Equipment (UE) of an Evolved Packet System (EPS) establishes a security key (K_eNB) for protecting Radio Resource Control/User Plane (RRC/UP) traffic exchanged with a serving eNodeB. The method comprises sending a Non-Access Stratum (NAS) Service Request to a Mobility Management Entity (MME), the request indicating a NAS uplink sequence number (NAS_U_SEQ). The method further comprises receiving an indication of the NAS_U_SEQ of the NAS Service Request sent to the MME, back from the MME via the eNodeB. The method further comprises deriving the K_eNB from at least the received indication of the NAS_U_SEQ and from a stored Access Security Management Entity-key (K_ASME) shared with said MME.

A server and method for sending a transaction receipt via a push notification is provided. The server comprises at least one processor; and at least one memory including computer program code; the at least one memory and the computer program code configured to, with the at least one processor, cause the server at least to: receive, from an issuer server, an approval message approving the user-initiated transaction request and transaction receipt details indicating a completion of the user-initiated transaction request, the user-initiated transaction request having corresponding transaction request details including a unique device identifier identifying a payment device that has been used to initiate the user-initiated transaction request; encrypt the transaction receipt details to provide encrypted transaction receipt details; and push, to the payment device identified by the unique device identifier, the encrypted transaction receipt details via a push notification channel.

A method begins by a dispersed storage (DS) processing module segmenting a data partition into a plurality of data segments. For a data segment of the plurality of data segments, the method continues with the DS processing module dividing the data segment into a set of data sub-segments and generating a set of sub keys for the set of data sub-segments based on a master key. The method continues with the DS processing module encrypting the set of data sub-segments using the set of sub keys to produce a set of encrypted data sub-segments and aggregating the set of encrypted data sub-segments into encrypted data. The method continues with the DS processing module generating a masked key based on the encrypted data and the master key and combining the encrypted data and the masked key to produce an encrypted data segment.

A series terminal for an automation system, having an insulating housing, which has an electrical contact on at least one side of the housing with which the series terminal can be connected with a data bus of an automation system. The series terminal comprises an integrated electronic processing unit which is connected to the at least one contact device and is designed for transmitting and/or receiving data via the data bus. In this case, the integrated electronic processing unit is set up to query a configuration of the automation system and, based on the configuration, to generate an individual cryptographic key for the automation system in conjunction with a secret cryptographic key stored in the series terminal.

The present disclosure provides a bootstrapping server, a network application function (NAF), a system and methods for establishing secure communication between a machine to machine (M2M) device and a NAF. A method for establishing secure communication between the NAF and M2M device comprises receiving a first data object, tunneling the first data object to the M2M device, via an interface between the NAF and the M2M device, for enabling the M2M device to derive first information to establish said secure communication, receiving a second data object and deriving second information for use in establishing said secure communication with the M2M device.

A system and a method of counter management and security key update for device-to-device (D2D) communication are provided. The method includes creating by a user equipment, a new packet data convergence protocol (PDCP) entity for a service group wherein a service group is identified by a destination identifier (ID), determining if any PDCP entity of the service group exists or not, generating a new proximity service (ProSe) traffic key (PTK) from a ProSe group key (PGK) corresponding to the service group associated with the new PDCP entity, initializing a new packet counter associated with the service group to zero if the new PDCP entity is a first PDCP entity associated with the service group, generating a ProSe encryption key (PEK) from the PTK and encrypting data packets mapped to the new PDCP entity using the PEK and a packet counter associated with the service group.

Presented herein is a system to set up a secure connection between nodes on two enterprise networks across a public network. The system includes a network element associated with each enterprise network. The first network element transmits a map request to a mapping server. The map request includes a destination address on the second enterprise network and a peer introduction request. The first network element includes a first key generation material in the peer introduction request. The second network element is configured to receive the map request forwarded from the mapping server, generate a map reply corresponding to the map request, and transmit the map reply to the first network element. The map reply includes a peer introduction reply with a second key generation material. The first network generates a secure key by inserting the second key generation material into a first key derivation function.