Secure key-exchange protocol for implants using heartbeats

Efficient Secret Key Delivery Using Heartbeats

“…However, all bits of an IPI does not have a high degree of entropy. Although the length of IPIs is from eight to ten bits in accordance with the sampling rate of a biometric sensor and each IPI is time-variant, it is known that only the three or four least-significant bits (LSBs) of all its bits are independent random variables [12][13].…”

“…Most related works [13,[15][16][17] have focused on how to efficiently synchronize IPIs having such a property. The work [15] firstly proposed the key establishment scheme using IPIs while the works [16] and [17] did not share any secret information between two parties in advance for key exchange.…”

“…The work [15] firstly proposed the key establishment scheme using IPIs while the works [16] and [17] did not share any secret information between two parties in advance for key exchange. Compared with these works, the work [13] does not use pre-deployed secret information while reducing the number of communication rounds considerably.…”

“…3 shows the outline of the work [13]. It is assumed that two biometric sensors (Sender and Receiver) are attached to the same subject.…”

“…If the IPIs are used for key establishment scheme, it is not necessary to derive the polynomial, unlike the fuzzy-vault, and there is no need to transmit chaff points, so the amount of computation and the amount of traffic can be greatly reduced. Although various IPI-based key establishment schemes [8][9][10][11][12] have been proposed so far, the work [13] recently proposed a simple and efficient IPI-based key delivery protocol. The work [13] encodes the secret key generated by biometric sensor A using an error correction code (ECC), then A hides it in a witness, which is generated from the biometric information measured by itself, and transmits it securely to another biometric sensor B.…”