一种解密方法包括：接收加密数据，其中加密数据系经RSA公钥加密；以及根据RSA私钥与加密数据依序进行复数笔运算，以获得解密数据，其中运算包括复数笔解密运算及至少一伪运算，解密运算包括至少一解密乘法运算以及至少一解密平方运算，至少一伪运算包括至少一第一伪乘法运算及至少一第一伪平方运算中的至少一者。

A decryption method includes receiving encrypted data, in which the encrypted data is encrypted by a RSA public key; and performing a plurality of operations in sequence according to a RSA private key and the encrypted data to acquire a decrypted data. The operations includes a plurality of decryption operations and at least one false operation. The decryption operations include at least one multiplication operation and at least one square calculation. The at least one false operation includes at least one of at least one first false multiplication operation and at least one first false square calculation.