Method for file encryption and decryption using telephone number

A method for encoding and decoding a file using a telephone number is disclosed. A method for decoding an encoded file by a computing device according to one aspect of the present invention comprises the steps of: transmitting a push message to a personal terminal according to a telephone number included in an encoding key by executing a decoding module which is included in an encoded file, when the encoded file is executed; authenticating the personal terminal using an authentication key transmitted from the personal terminal; and decoding the encoded file by the decoding module when the authentication of the personal terminal succeeds. According to the present invention, the method enables a receiver to decode an encoded file even when not knowing a decoding key only with a personal terminal according to a corresponding telephone number by performing file encoding using the telephone number of the receiver. [Reference numerals] (10) Create an encoding file; (20) Execute the encoding file; (AA) Provide the encoding file; (BB) Network