Digital image processing technology brought remarkable advancement of color copier, scanner, color printer etc. which can be bought inexpensively and wide-spread in our society and are very easy to access by everyone. Security printing industry is now encountering with a new threat of counterfeiting, in addition to conventional counterfeiting and forgery. In the computerized and automated society, security papers are demanded to have machine readable features for automatic vending machines, ATM, money changers, etc. Security printers must cope with this tendency. In this paper, present situation of security papers and security features are discussed. Conventional security features such as watermark, security thread, intaglio printing, microprintings etc. and newly developed security features such as color shift ink, OVDs, embossing, microperforation are described.
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