Authentication of Secret Information in Image Stenography

Abstract : In recent years, Steganography and Steganalysis are two important areas of research that involve a number of applications. These two areas of research are important especially when reliable and secure information exchange is required. Steganography is an art of embedding information in a cover image without causing statistically significant variations to the cover image. Steganalysis is the technology that attempts to defeat Steganography by detecting the hidden information and extracting. In this paper we propose an image Steganography that can verify the reliability of the information being transmitted to the receiver. The method can verify whether the attacker has tried to edit, delete or forge the secret information in the stegoimage. The technique embeds the hidden information in the spatial domain of the cover image and uses two special AC coefficients of the Discrete Wavelet Transform domain to verify the veracity (integrity) of the secret information from the stego image. The analysis shows that the BER and PSNR are improved in the case of DWT than DCT

Design and Implementation of Digital Signatures

Abstract : Digital Signature schemes are commonly used as primitives in cryptographic protocols that provide other services including entity authentication, authenticated key transport, and authenticated key agreement. A VLSI implementation of the digital signature scheme is proposed in this paper, for efficient usage in any cryptographic protocol. This architecture is based on Secure Hash Function and the 512-bit RSA cryptographic algorithm. The whole design was captured by using VHDL language and a FPGA device was used for the hardware implementation of the architecture. A method to reduce the switching activity of the overall design is introduced. The proposed VLSI implementation of the Digital Signature scheme achieves a data throughput up to 32 Kbit/sec