US 12,317,076 B2
Authenticated secure audio calling and digitally signed metadata for integrity verification
Nagendra Kumar Nainar, Morrisville, NC (US); David John Zacks, Vancouver (CA); and Vinay Saini, Bangalore (IN)
Assigned to Cisco Technology, Inc., San Jose, CA (US)
Filed by Cisco Technology, Inc., San Jose, CA (US)
Filed on Apr. 25, 2023, as Appl. No. 18/139,244.
Prior Publication US 2024/0365118 A1, Oct. 31, 2024
Int. Cl. H04L 29/06 (2006.01); H04L 9/32 (2006.01); H04M 3/42 (2006.01); H04W 12/065 (2021.01)
CPC H04W 12/065 (2021.01) [H04L 9/3213 (2013.01); H04M 3/42034 (2013.01)] 21 Claims
OG exemplary drawing
 
1. A method for secure audio communication between parties, the method comprising:
receiving, at a network-based security service, a call request from a calling party;
sending, at the network-based security service, a call notification to a receiving party;
receiving, at the network-based security service, a request for call authentication from the receiving party;
performing, by the network-based security service, a multifactor authentication of the calling party;
performing, by the network-based security service, a multifactor authentication of the receiving party;
establishing, by the network-based security service, a secure call between the calling party and the receiving party;
assigning a first token key to the receiving party, the first token key being unique to the receiving party;
embedding metadata in the secure call using the first token key and in a time series, wherein:
individual instances of the metadata embedded in the secure call include respective time stamps indicating respective times at which respective call data was generated or received; and
the individual instances of the metadata include the first token key that verifies that the respective times indicated by the respective time stamps at which the respective call data was generated or received are authentic.