i m doing dissertation in cryptography based digital image watermarking for gray scale image..so i need matlab source code for encryption and decryption for gray scale image ....etc

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Hi i need malab code for generation of pn code based on residue number system as soon as possible ....etc

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In cryptography the only need of high importance is
security of data.Few ways to achieve it is through public
key cryptography(PKC),secret key cryptography(SKC) and
using hash functions. Generic PKC employs two keys that
are mathematically related although knowledge of one key
does not allow someone to easily determine the other key.
One key is used to encrypt the plaintext and the other key is
used to decrypt the ciphertext(encrypted data). Because a
pair of keys are required, this approach is also called
asymmetric cryptography. T ....etc

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Introduction
One of the challenges in cryptography is generating seemingly random number sequences for use as encryption keys.

As you may know, any random number generated by a computer is not really random, it is what is called pseudo-random the numbers come from recursively solving a mathematical equation from a given seed number. The sequence will be different with each given seed value, and if you have a set of numbers and access to the algorithm that created them, it wouldn t take a computer very long to determine the seed value ....etc

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In recent years, the chaos based cryptographic algorithms have suggested some new and efficient ways to develop secure image encryption techniques. In this communication, we propose a new approach for image encryption based on chaotic logistic maps in order to meet the requirements of the secure image transfer. In the proposed image encryption scheme, an external secret key of 80-bit and two chaotic logistic maps are employed. The initial conditions for the both logistic maps are derived using the external secret key by providing different weig ....etc

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Hi
Kindly help me out with the matlab code for image encryption using catmap technique. ....etc

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To get full information or details of matlab coding for image encryption and decryption using aes algorithm please have a look on the pages

http://seminarsprojects.net/Thread-compact-and-efficient-encryption-and-decryption

if you again feel trouble on matlab coding for image encryption and decryption using aes algorithm please reply in that page and ask specific fields in matlab coding for image encryption and decryption using aes algorithm ....etc

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RSA

The RSA cryptosystem is a public-key cryptosystem that offers both encryption and digital signatures (authentication). Ronald Rivest, Adi Shamir, and Leonard Adleman developed the RSA system in 1977 .RSA stands for the first letter in each of its inventors' last names.

The RSA algorithm works as follows: take two large primes, p and q, and compute their product n = pq; n is called the modulus. Choose a number, e, less than n and relatively prime to (p-1)(q-1), which means e and (p-1)(q-1) have no common factors except 1. Find another numb ....etc

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To get full information or details of chaotic image encryption matlab source code please have a look on the pages

http://seminarsprojects.net/Thread-a-new-chaotic-algorithm-for-image-encryption

if you again feel trouble on chaotic image encryption matlab source code please reply in that page and ask specific fields in chaotic image encryption matlab source code ....etc

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ABSTRACT

Chaos maps and chaotic systems have been proved to be useful and effective for cryptography. In our study, the two-dimensional logistic map with complicated basin structures and attractors are first used for image encryption. The proposed method adopts the classic framework of the permutation-substitution network in cryptography and thus ensures both confusion and diffusion properties for a secure cipher. The proposed method is able to encrypt an intelligible image into a random-like one from the statistical point of view and the hum ....etc

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