Security has become an increasingly important feature with the growth of electronic communication. The Symmetric in which the same key value is used in both the encryption and decryption calculations are becoming more popular. The AES algorithm is capable of using cryptographic keys of 128, 192, and 256 bits to encrypt and decrypt data in blocks of 128 bits. This standard is based on the Rijnda...

Inside a dispersed foriegn atmosphere, anyone receives a untrusted company which has a change for better crucial allowing this foriegn to turn any kind of ABE ciphertext fulfilled through the wearer's features. Stability of ABE technique with outsourced decryption makes certain that a foe (including any destructive cloud) aren't going to be capable to study everything about the encrypted meanin...

We propose to relax the assumption that decryption failures are indistinguishable in security models for symmetric encryption. Our main purpose is to build models that better reflect the reality of cryptographic implementations, and to surface the security issues that arise from doing so. We systematically explore the consequences of this relaxation, with some surprising consequences for our un...

We give cryptographic schemes that help trace the source of leaks when sensitive or proprietary data is made available to a large set of parties. A very relevant application is in the context of pay television, where only paying customers should be able to view certain programs. In this application, the programs are normally encrypted, and then the sensitive data is the decryption keys that are...

This paper presents a new type of powerful cryptanalytic attacks on public-key cryptosystems, extending the more commonly studied adaptive chosen-ciphertext attacks. In the new attacks, an adversary is not only allowed to submit to a decryption oracle (valid or invalid) ciphertexts of her choice, but also to emit a “dump query” prior to the completion of a decryption operation. The dump query r...

This work uses enhanced symmetric key encryption algorithm, in which same structure of encryption and decryption procedure algorithm is used. In conventional encryption methods the key for encryption and decryption is same and remain secret. The algorithm uses key generation method by random number in algorithm for increasing efficiency of algorithm. The algorithm use key size of 512 bits for p...

Distributed-password public-key cryptography (DPwPKC) allows the members of a group of people, each one holding a small secret password only, to help a leader to perform the private operation, associated to a public-key cryptosystem. Abdalla et al. recently defined this tool [1], with a practical construction. Unfortunately, the latter applied to the ElGamal decryption only, and relied on the D...

Public cloud is an environment in which many users share resources, but the consumer has to sacrifice security owing to the multi tenancy feature of cloud computing. However, maintaining Confidentiality and Security for critical data is highly challenging. Taking account of the static nature of user validation, this paper address authentication and confidentiality issues. A methodology has been...

We show how to construct secret-key functional encryption (SKFE) supporting unbounded polynomially many functional decryption keys, that is, collusion-resistant SKFE solely from SKFE supporting only one functional decryption key. The underlying single-key SKFE needs to be weakly succinct, that is, the size of its encryption circuit is sub-linear in the size of functions. We show we can transfor...

To allow a delegator not only to delegate the keyword-controlled decryption rights of a broadcast encryption to a set of specified recipients, but also to control when the decryption rights will be delegated, in this paper, for the first time, we introduce a new notion called TimedRelease Conditional Proxy Broadcast Re-Encryption (TR-CPBRE). We also propose a concrete construction for TR-CPBRE ...