message area
3.When a message is encrypted in (H)ECC, there will be a large amount of message expansion. Due to this fact, (H)ECC is often applied in Diffie-Hellman key agreement protocols and digital signature schemes, though ECC encrypting cards have appeared but only devised for some special kind of small data area. In the application of hyperelliptic curve cryptosystems, the key operation is divisor scalar multiplication.
4.The characteristics and frame format of the paging channel are analyzed at first, then the bits of every text is calculated by analyzing the text of all kinds of messages sent through the paging channel, the efficiency of each message by calculating the bits of every text is provided, finally the relation between BHCA and paging channel load in a local area in some given conditions is provided.

