US Patent 11621837 Secure encryption of data using partial-key cryptography

Systems and methods for securing encrypted data wherein a sending computer encrypts data to be transmitted with an encryption key. The encryption key itself is not sent, but can be derived from a second key and third key. The second key is modified such that an incomplete portion of the second key is sent along with the message to a recipient computer. The third key is sent separately to the recipient computer. The recipient computer obtains the remainder of the second key, reconstructs the complete second key and then uses it with the third key to derive a decryption key to decrypt the message.