Integrated communication security

A circuit utilizing a clock signal at a first frequency to coordinate operations, comprising:

• a port configured to receive an encryption sequence from another system at the first frequency;
• a first unidirectional data path between the port and a memory configured to:
• permit data transfer from the port to the memory;
• and
• prevent data transfer from the memory to the port;
• the memory configured to access the encryption sequence from the port via the first unidirectional data path and store the encryption sequence;
• an encryption/decryption module configured to read a portion of the encryption sequence from the memory via a second unidirectional data path at a second frequency that is lower than the first frequency, process input using the portion of the encryption sequence, and generate output based on the processing;
• and
• a blockchain configured to implement tamper detection, wherein the blockchain is constructed via combining a blockchain header with at least a portion of the encryption sequence, and wherein the tamper detection is implemented by performing periodic reads of the blockchain header that is altered from a default state due to tampering.