The invention discloses a 
computer network safety attestation 
system and method that comprises terminal computer and network 
server, the input equipment of the terminal computer includes input unit (4) and interface unit (5), said terminal computer also includes 
control unit (1) and safe unit (2); the safe unit (2) receives the 
data input from the input unit (4) in safe inputting mode, encrypting 
data input with symmetry arithmetic by key, temporary key is encrypted and underwritten by the 
server general key transmitted by the network 
server with asymmetric arithmetic; said network server includes encrypting and deciphering unit(7); the encrypting and deciphering unit(7) deciphers the data 
package transmitted from the terminal computer with corresponding asymmetric arithmetic using server private key to obtain the key, validating the validity of temporary key, then the encrypted character string is deciphered with corresponding symmetry arithmetic using the temporary key to obtain 
data input by user. The inventions can guarantees the input data of computer not be filched, decrypted or forged.