An apparatus comprising: an integrated antenna enclosure including an RF shielded hollow enclosure, fixture(s) disposed within said hollow enclosure, and one or more antennas being at least one of integrated into, inserted into or configured in an array within said enclosure, said one or more antennas receiving emissions of unintended emitted electromagnetic energy and/or unintended conducted energy given off by one or more electrical devices received within said fixture(s); a sensor coupled to said one or more antennas and configured to capture said emissions of said unintended emitted electromagnetic energy and/or said unintended conducted energy from one or more electrical devices; one or more processors or logic devices; and a non-transitory computational and/or information storage medium comprising executable instructions that, when executed by said one or more processors or logic devices, cause said one or more processors or logic devices to perform the following steps on said captured emissions of said unintended emitted electromagnetic energy and/or said unintended conducted energy: measuring an emission feature value in at least one spectral frequency region of said captured emissions of said unintended emitted electromagnetic energy and/or unintended conducted energy from said one or more electrical devices, calculating a difference value between said measured emission feature value and a baseline emission feature value or between said measured emission feature value and another measured emission feature value, and determining, based on said calculated difference value, a presence or an absence of at least one of malicious software, anomalous software, modified software, malicious firmware, anomalous firmware, modified firmware, malicious circuitry, anomalous circuitry and modified circuitry within the one or more electrical devices, wherein said fixture(s) are configured to apply stimuli to the one or more electrical devices received therewithin, and at least one of said stimuli used to stimulate the one or more electrical devices is configured to sweep across at least one of a frequency span, a voltage range, a duty cycle, a pulse duration, a time interval, a power amplitude and an electromagnetic illumination range. an integrated antenna enclosure including an RF shielded hollow enclosure, fixture(s) disposed within said hollow enclosure, and one or more antennas being at least one of integrated into, inserted into or configured in an array within said enclosure, said one or more antennas receiving emissions of unintended emitted electromagnetic energy and/or unintended conducted energy given off by one or more electrical devices received within said fixture(s); a sensor coupled to said one or more antennas and configured to capture said emissions of said unintended emitted electromagnetic energy and/or said unintended conducted energy from one or more electrical devices; one or more processors or logic devices; and a non-transitory computational and/or information storage medium comprising executable instructions that, when executed by said one or more processors or logic devices, cause said one or more processors or logic devices to perform the following steps on said captured emissions of said unintended emitted electromagnetic energy and/or said unintended conducted energy: measuring an emission feature value in at least one spectral frequency region of said captured emissions of said unintended emitted electromagnetic energy and/or unintended conducted energy from said one or more electrical devices, calculating a difference value between said measured emission feature value and a baseline emission feature value or between said measured emission feature value and another measured emission feature value, and determining, based on said calculated difference value, a presence or an absence of at least one of malicious software, anomalous software, modified software, malicious firmware, anomalous firmware, modified firmware, malicious circuitry, anomalous circuitry and modified circuitry within the one or more electrical devices, wherein measuring an emission feature value in at least one spectral frequency region of said captured emissions of said unintended emitted electromagnetic energy and/or unintended conducted energy from said one or more electrical devices, calculating a difference value between said measured emission feature value and a baseline emission feature value or between said measured emission feature value and another measured emission feature value, and determining, based on said calculated difference value, a presence or an absence of at least one of malicious software, anomalous software, modified software, malicious firmware, anomalous firmware, modified firmware, malicious circuitry, anomalous circuitry and modified circuitry within the one or more electrical devices, wherein said fixture(s) are configured to apply stimuli to the one or more electrical devices received therewithin, and at least one of said stimuli used to stimulate the one or more electrical devices is configured to sweep across at least one of a frequency span, a voltage range, a duty cycle, a pulse duration, a time interval, a power amplitude and an electromagnetic illumination range.