In 1997, Ruppe R. et al [17] first proposed a Near-Term Digital Radio (NTDR) network system which is a cluster-based ad hoc network intended to be used efficiently for military missions. In the same year, Zavgren J. [18] proposed a management protocol for the NTDR network system. But they both lack the security considerations. In 2003, Varadharajan et al [4] proposed a secure cluster-based ad h...

We introduce a new cryptographic technique that we call universal re-encryption. A conventional cryptosystem that permits reencryption, such as ElGamal, does so only for a player with knowledge of the public key corresponding to a given ciphertext. In contrast, universal re-encryption can be done without knowledge of public keys. We propose an asymmetric cryptosystem with universal re-encryptio...

Multiple key agreement (MKA) protocols allow two parties to generate two or more session keys in one session, which will be used for future secure communications in public network. In recent years, many MKA protocols have been proposed. However, most of them do not consider ephemeral key compromise resilience, and some of them still exists security flaws. In this paper, we analyze the scheme pr...

A new conference key distribution scheme is proposed in this study for access control in a hierarchy. A group of users with a different security class can generate a common secret key over a public channel so that a secure electronic conference can be held. The security classes form a hierarchy such that users in a higher security class can obtain a secret session key with users in the same or ...

Secure group key distribution and efficient rekeying is one of the most challenging security issues in sensor networks at present. In this paper, Latin square is firstly used to construct orthogonal arrays in order to obtain t-packing designs quickly. Based on cover-free family properties, t-packing designs are adopted in key predistribution phase. Then based secure key-shared method, the pre-d...

The self-healing group key distribution with revocation can deal with the session key distribution problem for secure group communication over an unreliable wireless network, with the capability of resistance to the packet loss and the collusion attack. However, since previous self-healing group key distribution schemes are restricted to m sessions, they will be reset frequently, which leads to...

Scalable group key management solutions are crucial for supporting Internet applications that are based on a group communication model. Many solutions have been proposed and of these the most efficient and scalable ones are based on logical key hierarchies (LKH) with symmetric keys organized in a tree. However, these solutions centralize trust in the group controller and make it an attractive a...

In large-scale client-client communication environments, Password-Authenticated Key Exchange (PAKE) based on trusted server is very convenient in key management. For enhancing the efficiency and preventing various attacks, Wang and Mo proposed a three-PAKE protocol, Yoon and Yoo proposed a C2C-PAKE protocol. However, in this paper, we show that the Wang-Mo protocol and the Yoon-Yoo protocol exi...

In this paper we revisit a known but ignored weakness of the RC4 keystream generator, where secret state info leaks to the generated keystream, and show that this leakage, also known as Jenkins’ correlation or the RC4 glimpse, can be used to attack RC4 in several modes. Our main result is a practical key recovery attack on RC4 when an IV modifier is concatenated to the beginning of a secret roo...

The focus of this paper is to design an efficient and secure solution addressing the key escrow problem in ID-based signature schemes, i.e., the Private Key Generator (PKG) knows the user’s private key, which damages the essential requirement–“non-repudiation” property of signature schemes. In this paper, we proposed two ID-based threshold signature schemes, which both reach Girault’s trusted l...