The present invention relates to a multiple encrypting method, for encrypting a file and/or a protocol and generating encryption keys. Comprising the steps of: uploading at least one of a file and a protocol by a file uploading unit; generating random numbers by a random number generation unit; arranging the random numbers to form at least one key and at least one initialization vector respectively by a key generation unit and an initialization vector generation unit; encrypting the file and/or the protocol from the file uploading unit via using AES encryption by an encryption unit, so as to generate an encrypted file and/or an encrypted protocol; saving the key and the initialization vector respectively in a first storage unit and a second storage unit; Repeating the above steps at least one time.