Abstract: In many secure communication systems, group keys are updated on a regular basis in order to maintain high security level. Decryption and encryption keys are typically updated simultaneously in policy enforcement points (PEPs). Such approach makes the respective communication system prone to dropping of network traffic. According to at least one embodiment, re-keying is performed by installing, at a first phase, a new decryption key at the PEPs without removing an old decryption key previously installed in the PEPs. At a second phase, a new encryption corresponding to the new decryption key is installed and an old encryption key corresponding to the old decryption is removed. At a third stage, the old decryption key and any other old decryption keys are removed from the PEPs.

Abstract: A system and method for delivering highly customized, natural-sounding/appearing audio and/or visual content to existing player devices, including but not restricted to wired and wireless voicemail, sound-enabled PCs, and portable MP3 or DVD players. Subscribers register with existing content providers to receive alerts and information on topics they care about (e.g., portfolio updates, financial news, sports). If a user selects the audio and/or visual delivery option, the content provider passes his or her registration and preference information to the system. The content providers then pass news information to the system, which converts it to audio and/or visuals in one of two ways. For short, formulaic messages, the system concatenates spoken phrases and clauses previously recorded by human talent and stored in a Multimedia Library database, to create natural-seeming audio and/or visual sequences. For longer messages, the system uses human abilities entirely—i.e.