A method and system for maintaining network activity data for intrusion detection includes storing data representative of network activity in datasets. The datasets include root datasets each having a root keyset and child datasets each having a child keyset with a key combination derived from and less granular than a root keyset. Child datasets are identified through their root datasets.
An apparatus for reducing leakage currents in an integrated circuit having logic gates containing PMOS devices and NMOS devices. The apparatus comprises a power management unit capable of: i) applying a fixed VDD supply voltage to body connections of said PMOS devices; ii) applying a fixed VSS supply voltage to body connections of said NMOS devices; iii) applying an adjustable PMOS source voltage to sources of said PMOS devices; and iv) applying an adjustable NMOS source voltage to sources of said NMOS devices.