Abstract: A system for secure communications between computer devices includes a transmitter device and a receiver device that can communicate in a synchronized manner using unidirectional polarized light, where any physical interference in the light transmissions results in the termination of the communications channel. The system utilizes stream encryption in the transmitter device and the receiver device to encrypt the data payload being communicated.

Abstract: Methods and systems are disclosed for capturing and storing unmalleable evidence regarding the management of cryptographic keys and the application of keys to transaction data, where multiple hardware components are synchronized on an on-going basis to generate an interlinked proof and where the combined evidence are cryptographically merged into a singular hierarchical proof that is then recorded simultaneously on nodes of a distributed ledger system or blockchain system.

Abstract: A cryptographic system includes an online computer, an offline computer and custom hardware and software by which the two computers can securely communicate to facilitate the creation, secure use, and maintenance of private cryptographic keys. The system securely stores private cryptographic keys while still enabling the keys to be quickly and easily accessed as needed in a variety of applications including, but not limited to, electronic financial transactions, cryptographic transaction processing, medical record access, email encryption, or any other cryptographic authentication process.