Authentication and Key Agreement Algorithm for Handover of Next-Generation High-Speed Railway

Table 1

Notation and description.

Notation	Description	Value (bit)
IDn	Identity of device n	128
SUPI/SUCI	Subscription permanent identifier/subscription concealed identifier	128
Ti	The i-th time stamp	32
NH	Next hop key	256
Hash	Hash function	160
MACj	The j-th message authentication code	64
NCC	Next-hop chaining count	128
NSCI	Key data routing	128
PCI	Physical cell ID	128
SK	Session key	256