RSA

1.1Overview VISUAL cryptography (VC) is a branch of secret sharing data. In the VC scheme, a secret image is encoded into transparencies, and the content of each transparency is noise-like so that the secret information cannot be retrieved from any one transparency via human visual observation or signal analysis techniques. In general, a -threshold VC scheme has the following properties: The stacking of any out of those VC generated transparencies can reveal the secret by visual perception, but the

2. System Analysis 2.1 Existing System kallahalla et al has been proposed cryptographic storage system that helps user for securing his data by sharing data for the un trusted worthy servers based on the techniques that divides files into file groups and encrypting each file group with a file block key. In some times file block key also need to be changed and distributed for a user revocation, so the system should have heavy key distribution overhead. in other schemes have a data sharing on un

1. Type of operations used for transforming plaintext to cipher text. All encryption algorithms are based on two general principles. Those are substitution, in which each element in the plain text is mapped into another element and transposition in which elements in the plaintext are rearranged. The fundamental requirement is that no information be lost. Most systems referred to as product systems, involved multiple stages of substitution and transposition [2]. 2. The number of keys used: If sender

HISTORY OF RANSOMWARE The first known ransomware was the 1989 “AIDS Trojan” (also known as "PC Cyborg") written by Joseph Popp. This virus triggered a payload stating that the user 's software license had expired, encrypted file names on their hard drive, and then requested the user pay $189 to "PC Cyborg Corporation" for the passcode to unlock their files. Popp was declared mentally unfit to stand trial for his actions, but he promised to donate the profits from the malware to fund AIDS research

Simple Symmetric Protocol Alice may choose to use the simple symmetric protocol. It requires that Alice and Bob establish a secret key with which the location can be encrypted. The two need to somehow agree upon the secret key in a secure manner- like in a private conversation, for example. The steps to accommodate a secure exchange using a simple symmetric system would be: 1. Alice would type the witness ' location into a simple text file using an editor. 2. Alice would use the Rijndael cipher from

Abstract: In this proposed paper a study for public-key digital signature schemes that based on different mathematical NP hard problems. That problems influence in performance and reliability of digital signature schemes. In this paper we make a survey on mathematical NP hard problems of digital signature schemes and present the powerful and practical of some schemes depending on its security level. Introduction: Digital signature is a verification mechanism based on the public-key scheme, and

The security research of cloud database Hao Xu Professor: Carol Auerbach Course Number: EAP 6110 20 Date: 12/1/2014 1. Introduction 1.1 Background In September, there was breaking news in the American entertainment world – private pictures of Hollywood movie star Jennifer Lawrence and other celebrities were leaked online by hacker who stole the pictures from their Apple’s iCloud. People were shocked by this news, and a debate was generated online on whether cloud technology is

Contents 1 Cryptography 2 Introduction 2 Methods of encryption or cryptography. 2 Symmetric 2 Asymmetric 2 Operation and Working of Both Methods 3 Ingredients of symmetric encryption 3 Working of symmetric cryptography (Graphical Representation) 4 Ingredients of Asymmetric cryptography 4 Working principal of Asymmetric encryption (Graphical representation) 5 Strengths and Weaknesses of Both 6 Strength of Symmetric Encryption 6 Strength of Asymmetric Encryption 6 Weakness of symmetric encryption 6

Chapter: 4 Summary Basically there are two hiding techniques and those are Cryptography and Steganography. In cryptography an encryption and decryption keys will be available for encoding and decoding purpose respectively and it is having triple key to provide secured data to the receiver safely. Now in steganography not only encryption and decryption are to be done but there is cover media to

Introduction The goal of our research paper is to provide a concise analysis on data security and privacy protection issues pertaining to data and databases as well as the current advancement/ breakthrough made and achieved in regards to database security and privacy concerns. We will also discuss in this paper some current solutions in the security market. First, we looked at the a trusted database model which makes it possible to shield database with absolute secrecy to benefit trusted equipment