Methods and systems for secure message transmissions between trust domains

A method for routing communications from a low-trust domain to a high-trust domain, the method implemented by a first processor and a second processor, the method comprising:

• receiving a packet from the low-trust domain to be transmitted to the high-trust domain, wherein the packet includes a message and a source address;
• comparing, by the first processor, the source address to a white list of source addresses;
• if the source address matches the white list, comparing, by the first processor, the message to one or more messaging requirements;
• if the message meets the one or more messaging requirements, writing, by the first processor, the message to a memory;
• reading, by the second processor, the message from the memory;
• comparing, by the second processor, the message to a plurality of stored values;
• and
• if the message matches the plurality of stored values, acting, by the second processor, upon the message.

A system for routing communications from a low-trust domain to a high-trust domain, the system comprising:

• a plurality of computer devices associated with a low-trust domain;
• at least one computer device associated with a high-trust domain;
• and
• a domain guard computer device comprising a first processor, a second processor, and at least one memory device, wherein the domain guard computer device is in communication with the plurality of computer devices associated with the low-trust domain and the at least one computer device associated with the high-trust domain, and wherein the domain guard computer device is programmed to:
• receive a packet from a computer device of the plurality of computer devices associated with the low-trust domain to be transmitted to the at least one computer device associated with the high-trust domain, wherein the packet includes a message and a source address;
• compare, by the first processor, the source address to a white list of source addresses, wherein the white list of source addresses includes addresses for the plurality of computer devices associated with the low-trust domain;
• if the source address matches the white list, compare, by the first processor, the message to one or more stored messaging requirements;
• if the message meets the one or more stored messaging requirements, write, by the first processor, the message to a memory;
• read, by the second processor, the message from the memory;
• compare, by the second processor, the message to a plurality of stored values;
• and
• if the message matches the plurality of stored values, act, by the second processor, upon the message.