1. A decryption method comprising: receiving encrypted data, wherein the encrypted data is encrypted according to an RSA public key; and performing a plurality of operations in sequence, according to an RSA private key and the encrypted data, to acquire a decrypted data; wherein the operations comprise a plurality of decryption operations and at least one false operation, the decryption operations comprise at least one decryption multiplication operation and at least one decryption square calculation, and the at least one false operation comprises at least one of at least one first false multiplication operation and at least one first false square calculation.