Mitb attack response method using two-channel authentication

The present invention relates to a method for certifying financial transaction information, which comprises the steps of: receiving first financial transaction information of a first user terminal; receiving second financial transaction information of a second user terminal; and determining whether the first financial transaction information was forged or tampered by comparing the first financial transaction information with the second financial transaction information, wherein the second financial transaction information is generated using an image capturing the first financial transaction information outputted in a display of the first user terminal by a photographing unit of the second user terminal, whereby forgery of the financial transaction information can be prevented through a two-channel authentication. [Reference numerals] (310) Receiving first financial transaction information from a first user terminal; (320) Receiving second financial transaction information from a second user terminal; (330) Determining whether the first financial transaction information was forged or tampered by comparing the first financial transaction information with the second financial transaction information; (AA) Start; (BB) End