Method and apparatus for encoding security status information

A wireless device comprising:

• one or more processors configured to:
• store a local value of a frame counter;
• receive a second message after a first message over a wireless network, the second message including a sequence counter value identifying the second message relative to other messages in a stream of messages and data encrypted by a correspondent using a secret key;
• determine a new value of the frame counter from the local value of the frame counter and the sequence counter value in the second message;
• and
• decrypt the second message based on the new value of the frame counter.

A wireless device comprising:

• one or more processors configured to:
• store a local value of a frame counter of a recipient;
• compute a new value of the frame counter from the local value of the recipient and a sequence counter value identifying a second message relative to other messages in a stream of messages;
• encrypt data in the second message using a secret key and the new value of the frame counter;
• and
• send the second message to the recipient over a wireless network, the second message including the sequence counter value and the encrypted data.

A method, comprising:

• storing a local value of a frame counter;
• receiving a second message after a first message over a wireless network, the second message including a sequence counter value identifying the second message relative to other messages in a stream of messages and data encrypted by a correspondent using a secret key;
• determining a new value of the frame counter from the local value of the frame counter and the sequence counter value in the second message;
• and
• decrypting the second message based on the new value of the frame counter.

A non-transitory computer readable medium storing instructions to cause a processor to perform operations comprising:

• storing a local value of a frame counter;
• receiving a second message after a first message over a wireless network, the second message including a sequence counter value identifying the second message relative to other messages in a stream of messages and data encrypted by a correspondent using a secret key;
• determining a new value of the frame counter from the local value of the frame counter and the sequence counter value in the second message;
• and
• decrypting the second message based on the new value of the frame counter.

A method, comprising:

• storing a local value of a frame counter of a recipient;
• computing a new value of the frame counter from the local value of the recipient and a sequence counter value identifying a second message relative to other messages in a stream of messages;
• encrypting data in the second message using a secret key and the new value of the frame counter;
• and
• sending the second message to the recipient over a wireless network, the second message including the sequence counter value and the encrypted data.

A non-transitory computer readable medium storing instructions to cause a processor to perform operations comprising:

• storing a local value of a frame counter of a recipient;
• computing a new value of the frame counter from the local value of the recipient and a sequence counter value identifying a second message relative to other messages in a stream of messages;
• encrypting data in the second message using a secret key and the new value of the frame counter;
• and
• sending the second message to the recipient over a wireless network, the second message including the sequence counter value and the encrypted data.