Abstract: A system stores pedigrees that include details of how and when each of multiple blocks of encryption key material were distributed between two endpoints using quantum cryptographic techniques. The system receives an indication of a possible quantum cryptographic security violation and accesses the stored pedigrees to identify one or more of the multiple blocks of encryption key material that may have been compromised.

Abstract: A system stores pedigrees that include details of how and when each of multiple blocks of encryption key material were distributed between two endpoints using quantum cryptographic techniques. The system receives an indication of a possible quantum cryptographic security violation and accesses the stored pedigrees to identify one or more of the multiple blocks of encryption key material that may have been compromised.

Abstract: The disclosed technology provides a system and method of securely communicating data. An encryptor located at a transmitter can provide encrypted data to the transmitter. The transmitter can maintain a packet number indicating a particular packet for carrying the encrypted data and a sub-packet number indicating a position within the packet where the encrypted data is to be stored. The encryptor can produce the encrypted data using an encryptor seed generated based on the packet number and sub-packet number. A receiver can maintain a receiver packet number indicating a number of previously received packets and can compute a receiver sub-packet number. The receiver can receive a packet containing encrypted data and can decrypt the encrypted data using a decryptor seed generated based on the receiver packet number and sub-packet number.

Abstract: The disclosed technology provides a system and method of synchronizing cryptographic operation between a transmitter and a receiver. A transmitter can communicate encrypted data to a receiver according to a first communications protocol, and communicate a transmitter number and a portion of the encrypted data to the receiver according to a second communications protocol. The receiver can be in communication with a memory space containing locations that are each associated with an encrypted data and that can contain a previous receiver number. The receiver can receive transmitted encrypted data and an associated transmitter number and can search the memory space to find a location wherein the encrypted data associated with the location is entirely, or in part, the same as the transmitted encrypted data. When such a location is found, the receiver can compare the transmitter number with the previous receiver number stored in the location.