為了確保資訊的安全，應用密碼學進行加密是最常見的方法。然而資訊經過加密後變成一堆毫無意義的亂碼，在網路傳遞時反而容易引起有心人士的破壞或破解。另一方面，資訊隱藏技術則利用媒體的特性將資訊的存在性隱藏起來，令人無法直接察覺，進而達到保護的效果。

　　近年來二維條碼的應用日益發達，二維條碼可透過紙張等物理媒介有效率的傳遞數位資訊，而且在處理的過程中充分考慮雜訊所帶來的影響，因此適合利用資訊隱藏方法，將機密資訊隱藏於二維條碼之中。本論文實作一完整的系統來透過二維條碼傳遞機敏資訊，並且利用資訊隱藏技術改良既有方法來傳遞密碼或密鑰。

　Encryption is the most frequently used method to secure the transmitted message over unsafe channels. However, ciphertext always looks like random string and can be easily detected by attackers. On the other hand, information hiding technologies utilize the characteristic of media or the representation of data to camouflage the existence of hidden message in order to protect the secrets.

　QR code and other two-dimensional codes have gained wide applications in recent years. These codes are able to transmit information via physical media like papers in an efficient manner. Since QR code is designed to be tolerant of noise and has random-bits-like representation, it is naturally suitable for the use of information hiding method. This thesis improves an existing approach and demonstrates a complete implementation on sending confidential data with QR code by embedding the password or secret key as noise.

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