Packet-based and pseudo-packet based cryptographic communications systems and methods
View Patent ↗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.
1. A method of securely communicating data, the method comprising:
first receiving bytes of encrypted data in a bit-stream;
determining a current pseudo-packet number based on a previous pseudo-packet number for previously received encrypted data;
storing said encrypted data as a pseudo-packet, and storing said current pseudo-packet number associatively with said pseudo-packet in a database including stored pseudo-packets and associated pseudo-packet numbers;
receiving a transmission containing second encrypted data and a second pseudo-packet number;
searching said database to obtain a match between said second encrypted data and a portion of one pseudo-packet of said stored pseudo-packets;
adjusting said current pseudo-packet number based on a relation between said second pseudo-packet number and a pseudo-packet number associated with said one pseudo-packet to obtain an adjusted pseudo-packet number wherein said adjusting further comprises:
determining an offset of said portion from a beginning of said one pseudo-packet;
comparing said offset to a byte adjustment value for incrementing said current pseudo-packet number; and
when said offset is not equal to said byte adjustment value, discarding a number of bytes of said encrypted data and setting said byte adjustment value to equal said offset; and
returning to said first receiving using the adjusted pseudo-packet number as the previous pseudo-packet number when additional data is communicated.
2. The method of claim 1 , wherein said discarding further comprises:
discarding a number of bytes equal to said offset when said offset is less than said byte adjustment value; and
discarding a number of bytes equal to said offset less said byte adjustment value when said offset is greater than said byte adjustment value.