System and method of lawful access to secure communications
View Patent ↗The present disclosure relates to systems and methods for secure communications. In some aspects, one or more values used to generate an encryption key used to encrypt a packet are stored in a header of the packet. The packet is transmitted with the encrypted data portion in a communication. In some aspects, one or more values used to generate an encryption key are received. The encryption key is regenerated using the one or more values.
1. A method for secure communication, the method comprising:
storing in a header of a packet one or more values used in generation of an encryption key used to encrypt the packet, wherein the one or more values comprise a nonce value that is combined with a secret key to generate a random number, wherein the random number is used to generate the encryption key, and wherein the packet is a secure real-time transport protocol (SRTP) packet and the header is an SRTP header;
encrypting at least a data portion of the packet using the encryption key; and
transmitting the packet with an encrypted data portion in a communication.
2. The method of claim 1 , wherein the one or more values are stored in a master key identifier (MKI) field of the SRTP header.
3. The method of claim 1 , wherein the one or more values further comprise a crypto session identity (CS ID) and a traffic encryption key generation key (TGK).
4. The method of claim 3 , wherein the nonce value comprises a value associated with an initiator of the communication.
5. The method of claim 1 , wherein the encryption key is a traffic encryption key generated following a MIKEY-TICKET protocol.
6. The method of claim 1 , wherein the one or more values are stored in the header to assist with lawful access to the secured communication.
7. The method of claim 1 , wherein some of the one or more values are not required for the secured communication.