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

Claim 8:
9. A communication device, comprising:
at least one hardware processor;
a non-transitory computer-readable storage medium coupled to the at least one hardware processor and storing programming instructions for execution by the at least one hardware processor, wherein the programming instructions instruct the at least one hardware processor to:
receive a plurality of frames, wherein each individual frame from 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:
identify a security level for the individual frame based on the security control bits in the header of the individual frame;
check said security level against predetermined security requirements for said communication device; and
reject the individual frame in response to said security level not meeting said predetermined security requirements.