Integrity verification method of Thai content for faxed document

Problem of altering content of faxed document extends in wider range including in Thailand. Since most companies/organizations in Thailand use only one fax machine for common use in each department to reduce the telephone payment and complexity of fax management, someone with malicious intention may get a faxed document directly and personally from fax machine, and then alter the content inside for his/her benefits. In this paper, such problem is addressed, and an integrity verification method of Thai content for faxed document based on MAC algorithm is proposed to detect changes in its content. Our proposed method can be applied to both traditional machine based faxing and Internet fax & fax software. The experimental results show the efficiency of the proposed method with different font sizes.