mobopts-1----Page:6
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16
|
Dynamic SPI SPI update After getting BU and BA, HA and MN change their SPIs respectively in order to protect the profiling attack. new SPI = (the current SPI + SPI_increment) SPI_increment = First(8, HMAC_SHA1(Kph, the current SPI)) If SPI_increment = 0, then set SPI_increment = 1 |