Information processing apparatus, mobile apparatus, and communication system

A mobile apparatus comprising:

• an information processing apparatus including
• a pixel circuit that outputs image data;
• a memory that stores instructions;
• and
• at least one processor configured to execute the instructions to perform operations comprising:
• performing communication with a different information processing apparatus, and, when performing data communication of data of a frame including the image data, transmits a packet including a packet header and packet data to the different information processing apparatus or receives the packet from the different information processing apparatus,
• performing a protection process that generates, verifies, or decodes protected data of the packet data by using a session key, and
• updating a nonce value for the session key every time the protected data is generated, verified, or decoded, wherein
• the image data is stored in the packet data,
• the data communication includes transmission or reception of part or a whole of the nonce value,
• the part or the whole of the nonce value is stored outside the packet header and transmitted or received,
• the packet is an extended packet,
• the packet header is an extended packet header,
• the nonce value includes a message count value that is updated every time the extended packet satisfying a predetermined count condition is transmitted or received, and
• the message count value is stored in the extended packet header.

A communication system comprising:

• an information processing apparatus including
• a memory storing instructions;
• and
• at least one processor configured to execute the instructions to perform operations comprising:
• performing communication with a different information processing apparatus, and, when performing data communication of data of a frame including image data, transmits a packet including a packet header and packet data to the different information processing apparatus or receives the packet from the different information processing apparatus,
• performing a protection process that generates, verifies, or decodes protected data of the packet data by using a session key, and
• updating a nonce value for the session key every time the protected data is generated, verified, or decoded, wherein
• the image data is stored in the packet data,
• the data communication includes transmission or reception of part or a whole of the nonce value,
• the part or the whole of the nonce value is stored outside the packet header and transmitted or received,
• the packet is an extended packet,
• the packet header is an extended packet header,
• the nonce value includes a message count value that is updated every time the extended packet satisfying a predetermined count condition is transmitted or received, and
• the message count value is stored in the extended packet header.