Abstract: A computer-implemented method includes receiving, by a storage system, encrypted data and a set of key identifiers. Each key identifier is associated with information specifying a storage location for which the key identifier is authorized. The method also includes storing, by the storage system, the encrypted data in at least one storage location and receiving, by the storage system, at least one key identifier of the set of key identifiers with a data access request. The method includes determining, by the storage system, whether the data access request is authorized for the at least one key identifier.

Abstract: An underwater acoustic transmitter adapted to be released from a submerged ubmarine to float towards the surface of the water and explode a plurality of signalling charges at a predetermined depth in a predetermined time sequence.

Abstract: An underwater communication system capable of being delivered by a missile or detonating a plurality of charges in a timed sequence. The system includes a main power supply, decelerometer means, separation switch means for electrically interconnecting and energizing the decelerometer means and said main power supply upon receipt of an arming signal from the missile, thermal battery means, means coupled to said decelerometer means for deploying a parachute and for energizing the thermal battery means, timer means for releasing the explosive charges in a predetermined sequence and means couples to the thermal battery means for energizing the timer means.

Abstract: A deep water explosive echo ranging system capable of detecting high perfance submarines by using favorable acoustic paths available at deep depths. An umbrella hydrophone array is deployed from a sonobuoy to deep depths; an electrical subsystem transmits data from the hydrophone array to a transmitter housed in a surface float unit; a multichannel receiver and signal processing and display apparatus in an aircraft receives and processes radio data signals sent from sonobuoy transmitters; and an explosive underwater charge package is remotely triggered by a command generator in the aircraft.