Information Security and Sender’s Rights Protection through Embedded Public Key Signature

Information security is not just to provide an authenticity and integrity to the data, but there is also a need to seek identity, rights of use and origin of information, which may require some degree of process re-engineering. Rarely security technologies like digital signatures can be simply “plugged in” without streamlining the process. In this paper we address the problem of information security and protecting the rights of originator of the structured document from ill-intentioned recipient who can modify the received decrypted information. At sender end, a public key signature is generated using SHA-1 or SHA-2. Signature is embedded into raster image of the document using non-invertible robust public key watermarking technique based on orthogonal signals concepts. The document is then encrypted with public key of the receiver using RSA algorithm to achieve confidentiality and authorization. The proposed scheme uses correlation analysis to detect embedded signature to authenticate message. This scheme also uses Gauss-Jordan method to derive the signature from the watermarked image to verify ownership. The study is corroborated with result and application of the proposed technique to prevent forgery and alteration in e-cheque document.