Patent ID: 11870787
Assignee: BLACKBERRY LIMITED
Field: Digital communication (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A non-transitory computer-readable medium storing instructions which, when executed, cause a communication device to perform operations comprising:
receiving a plurality of frames, wherein each individual frame in the plurality of frames has a header and associated data, the header of each individual frame including security control bits that indicate for the individual frame whether encryption has been provided for the individual frame and whether integrity has been provided for the individual frame, wherein the security control bits include one or more security mode bits and integrity level bits, wherein the one or more security mode bits indicate whether encryption is on or off, and wherein the integrity level bits indicate which of at least three integrity levels is utilized, the integrity levels corresponding to signing operations of different strength; and
for each individual frame:
identifying a security level for the individual frame based on the security control bits in the header of the individual frame;
checking said security level against predetermined security requirements; and
rejecting the individual frame in response to said security level not meeting said predetermined security requirements.