A new digital signature scheme with message recovery using hybrid problems

We present a new digital signature scheme with message recovery and its authenticated encryption based on elliptic curve discrete logarithm and quadratic residue. The main idea is to provide a higher level of security than all other techniques that use signatures with single hard problem including factoring, discrete logarithm, residuosity, or elliptic curves. The proposed digital signature schemes do not involve any modular exponentiation operations that leave no gap for attackers. The security analysis demonstrates the improved performance of the proposed schemes in comparison with existing techniques in terms of the ability to resist the most common attack

A Secure Scheme for Authenticated Encryption

The paper proposes a new scheme of authenticated encryption that is either publicly verifiable or not publicly verifiable depending on the quantity of information the recipient released. This property would give recipient much flexibility in many applications. This scheme combines the ElGamal encryption with Schnorr signature. Considering the security goal of signature, the resultant scheme is at least as secure as that of the combined signature scheme. The security goal of encryption is examined under the chosen ciphertext attack, it is proven directly related to the security of signature. Furthermore, this new scheme is also secure against one-more-decryption attack. This novel security goal may be valuable in the applications of private information retrieval

An Efficient Authenticated Encryption Scheme With Message Linkages and Low Communication Costs

[[abstract]]An efficient authenticated encryption scheme with message linkages is proposed. For achieving both privacy and integrity in data communications, the proposed scheme requires smaller bandwidth and computational time when compared to previously proposed authenticated encryption schemes with message linkages. Moreover, the proposed scheme allows the verifier to recover and verify the message blocks simultaneously, and hence, the message recovery phase could be speeded up. The security of the proposed scheme is based on the authenticated encryption scheme as well as the one-way hash cryptographic function assumption