We achieve a dynamic update of the authentication-tree through creating the sub tree and dynamic update of the key.In the original signature

the number of the signature influence the scale of the authentication-tree

and the increase of the number of signature makes lower efficient.In our scheme

the number of signature is not affected by the scale of the authentication-tree.In addition

the paper do a safety analysis to the impro ved authentication Merkle tree signature

the results show that the signature of the improver Merkle authentication is as safe as the original Merkle authentication signature tree

and as used key management according the time

the The signature also has forward-secure.