Identity based signature in system information protection

A method for wireless communication at a base station, comprising:

• receiving a private security key generated at a network entity;
• determining synchronization information based at least in part on a synchronization signal, the synchronization information being indicative of, at least in part, a system frame number, a hyper system frame number, or both;
• determining a randomness parameter based at least in part on the system frame number, the hyper system frame number, or a combination thereof;
• verifying that the randomness parameter is different than a randomness parameter used in a previous session or that the randomness parameter is within an error range based at least in part on an estimated value derived from the system frame number and the hyper system frame number;
• determining a signature that indicates that a system information message is associated with a cell identifier associated with the base station, wherein the signature is based at least in part on the private security key and the randomness parameter;
• including the signature with the system information message;
• and
• transmitting the system information message to one or more user equipments (UEs).

An apparatus for wireless communication at a user equipment (UE), comprising:

• a processor,
• memory in electronic communication with the processor;
• and
• wherein the processor and the memory are configured to:
• receive a system parameter identified by a network entity;
• determine synchronization information based at least in part on a synchronization signal, the synchronization information being indicative of, at least in part, a system frame number, a hyper system frame number, or both;
• determine a randomness parameter based at least in part on the system frame number, the hyper system frame number, or a combination thereof;
• verify that the randomness parameter is different than a randomness parameter used in a previous session or that the randomness parameter is within an error range based at least in part on an estimated value derived from the system frame number and the hyper system frame number;
• receive a system information message, the system information message comprising a signature that indicates that the system information message is associated with a cell identifier associated with a base station, wherein the signature is based at least in part on the system parameter and the randomness parameter;
• determine the cell identifier from the system information message;
• verify the signature based at least in part on one or more of the cell identifier, the system parameter, or the randomness parameter.

An apparatus for wireless communication at a base station, comprising:

• a processor,
• memory in electronic communication with the processor;
• and
• wherein the processor and the memory are configured to:
• receive a private security key generated at a network entity;
• determine synchronization information based at least in part on a synchronization signal, the synchronization information being indicative of, at least in part, a system frame number, a hyper system frame number, or both;
• determine a randomness parameter based at least in part on the system frame number, the hyper system frame number, or a combination thereof;
• verify that the randomness parameter is different than a randomness parameter used in a previous session or that the randomness parameter is within an error range based at least in part on an estimated value derived from the system frame number and the hyper system frame number;
• determine a signature that indicates that a system information message is associated with a cell identifier associated with the base station, wherein the signature is based at least in part on the private security key and the randomness parameter;
• include the signature with the system information message;
• and
• initiate transmission of the system information message to one or more user equipments (UEs).