Secure passcode processing device

A method comprising:

• receiving, by a secure processing unit, a first encrypted audio signal from an audio processor;
• decrypting, by the secure processing unit, the first encrypted audio signal;
• responsive to determining that the first encrypted audio signal includes an unlock command, output, by the secure processing unit, an indication of a decryption key;
• receiving, by a general processing unit, a second encrypted audio signal from the audio processor;
• and
• decrypting, by the general processing unit, the second encrypted audio signal with the decryption key.

A computing system comprising:

• at least one sensor coupled to an input processor, the input processor being configured to receive at least one signal from the at least one sensor including both audio and video data, and generate a first encrypted signal and a second encrypted signal;
• a secure processing unit configured to:
• receive the first encrypted signal from the input processor,
• decrypt the first encrypted signal, and
• responsive to determining that the first encrypted signal includes an unlock command, output an indication of a decryption key;
• and
• a general processing unit configured to:
• receive the second encrypted signal from the input processor, and
• decrypt the second encrypted signal with the decryption key.