A method performed by a sending apparatus, said method comprising: - generating a message comprising a plurality of encrypted payload information items, wherein each of said plurality of encrypted payload information items is decryptable with a respective decryption key of a plurality of decryption keys, wherein said respective decryption key of said plurality of decryption keys is different for each of said plurality of encrypted payload information items, wherein said plurality of encrypted payload information items comprises at least a first encrypted payload information item and a second encrypted payload information item, wherein said first encrypted payload information item is decryptable with a first decryption key and the second encrypted payload information item is decryptable with a second decryption key different from said first decryption key, - determining whether at least one recipient is allowed to access one or more of said encrypted payload information items of said plurality of encrypted payload information items, wherein different recipients of said message are allowed to access partially different encrypted payload information items of said plurality of encrypted payload information items, - generating at least one decryption key set for said at least one recipient, wherein said at least one decryption key set for said at least one recipient comprises a respective decryption key of said plurality of decryption keys for each of said one or more of said encrypted payload information items of said plurality of payload information items for which it is determined that said at least one recipient is allowed to access, and sending said message to said at least one recipient. - generating a message comprising a plurality of encrypted payload information items, wherein each of said plurality of encrypted payload information items is decryptable with a respective decryption key of a plurality of decryption keys, wherein said respective decryption key of said plurality of decryption keys is different for each of said plurality of encrypted payload information items, wherein said plurality of encrypted payload information items comprises at least a first encrypted payload information item and a second encrypted payload information item, wherein said first encrypted payload information item is decryptable with a first decryption key and the second encrypted payload information item is decryptable with a second decryption key different from said first decryption key, - determining whether at least one recipient is allowed to access one or more of said encrypted payload information items of said plurality of encrypted payload information items, wherein different recipients of said message are allowed to access partially different encrypted payload information items of said plurality of encrypted payload information items, - generating at least one decryption key set for said at least one recipient, wherein said at least one decryption key set for said at least one recipient comprises a respective decryption key of said plurality of decryption keys for each of said one or more of said encrypted payload information items of said plurality of payload information items for which it is determined that said at least one recipient is allowed to access, and sending said message to said at least one recipient. <EOS>