Encrypt

As of late Ransomware infection programming spread like a violent wind winds. A twister wind makes damage properties; similarly ransomware makes PC information non secure. Each client is moving towards digitization. Client keep information sec ure in his or her PC. A ransomware is one of the program infection that commandeer client's information. A ransomware may secure the framework a way which isn't for a normal individual to reverse.It not just targets home computers but business additional ly gets influenced. It scrambles information so that ordinary individual can never again unscramble. An individual needs to pay payment to unscramble it. However, it doesn't produce that documents will be discharged. This paper gives a concise investiga tion of Ryuk ransomware, its impact on PC world and its preventive measures to control ransomware on PC framework.

Preserving the secrecy of confidential information has its own importance right from the early era of computing. Steganography is the art of hiding the messages inside other harmless medium in such a way that an enemy cannot even sense the presence of the secret message. But if the presence of information behind media is revealed or detected, the objective of steganography is violated and security is compromised. This paper proposes and analyzes a methodology for video steganography that pre-processes the text before hiding it behind a cover video. In pre-processing process, the text is first compressed and then modified using a key. The proposed method combines the idea of video steganography, cryptography and compression techniques which provide enhanced security. The RC4 is used for encrypting the compressed text and 4LSB method is used to conceal the processed text inside the cover media, while the purpose of compression is to enhance security and increase embedding capacity.

proposal suggests that using two 56-bit keys but enciphering 3 times (encrypt with a first key, decrypt with a second key, then encrypt with the first key again) increases security over simple double encryption. This paper shows that although either technique significantly improves security over single encryption, the new technique does not significantly increase security over simple double encryption. Cryptanalysis of the ll2-bit key requires about 256 operations and words of memory, using a chosen plaintext attack. While DES is used as an example, the technique is applicable to any similar cipher.

Signcryption simultaneously offers authentication through unforgeability and confidentiality through indistinguishability against chosen ciphertext attacks by combining the functionality of digital signatures and public-key encryption into a single operation. Libert and Quisquater (PKC 2004) extended this set of basic requirements with the notions of ciphertext anonymity (or key privacy) and key invisibility to protect the identities of signcryption users and were able to prove that key invisibility implies ciphertext anonymity by imposing certain conditions on the underlying signcryption scheme. This paper revisits the relationship amongst privacy notions for signcryption. We prove that key invisibility implies ciphertext anonymity without any additional restrictions. More surprisingly, we prove that key invisibility also implies indistinguishability against chosen ciphertext attacks. This places key invisibility on the top of privacy hierarchy for public-key signcryption schemes.