Abstract: A method is provided to share a content stored on a secured server. The content is associated to a first electronic device and encrypted using a public key of the first electronic device. The secured server stores a first re-encryption key from the first electronic device to a second electronic device. The method is implemented by the secured server and includes the steps of determining association of the content with the second electronic device, re-encrypting the content using the first re-encryption key, sending the content to the second electronic device for encryption using a second device public key and storing the encrypted content received from the second electronic device in association with the second electronic device.

Abstract: A method implemented by a terminal for accessing a CSG femtocell of a first access network. The terminal includes a list containing identifiers of CSG femtocells to which an access right is defined. The method includes: scanning a frequency band for discovering CSG femtocells; decoding, based on a key, a data stream broadcasted from the CGS femtocells; obtaining, based on the decoded data stream, an identifier of the CSG femtocells; and determining, based on the list, whether the terminal has authorized access to the discovered femtocells. The frequency band, the key or the list is determined based on a message received from a remote server via a second cellular access network different from the first access network.

Abstract: A method is provided to share a content stored on a secured server. The content is associated to a first electronic device and encrypted using a public key of the first electronic device. The secured server stores a first re-encryption key from the first electronic device to a second electronic device. The method is implemented by the secured server and includes the steps of determining association of the content with the second electronic device, re-encrypting the content using the first re-encryption key, sending the content to the second electronic device for encryption using a second device public key and storing the encrypted content received from the second electronic device in association with the second electronic device.

Abstract: A method implemented by a terminal for accessing a CSG femtocell of a first access network. The terminal includes a list containing identifiers of CSG femtocells to which an access right is defined. The method includes: scanning a frequency band for discovering CSG femtocells; decoding, based on a key, a data stream broadcasted from the CGS femtocells; obtaining, based on the decoded data stream, an identifier of the CSG femtocells; and determining, based on the list, whether the terminal has authorised access to the discovered femtocells. The frequency band, the key or the list is determined based on a message received from a remote server via a second cellular access network different from the first access network.