INTERNATIONAL JOURNAL OF COMPUTERS & TECHNOLOGY

Fair Certified Email Protocol

Abdullah Mohammed Alaraj

Published Jul 25, 2013• 3 citations

Abstract

In this paper, a new fair certified email protocol is proposed. The proposed protocol uses offline trusted third party (TTP) that will only be involved if a party misbehaves, otherwise the TTP is inactive. The protocol is based on the verifiable and recoverable encryption of keys. In this regard, the recipient of an email will be able to verify if the encrypted key used to encrypt the email is correct. The protocol comprises of only three messages in the exchange sub-protocol and three messages in the recovery sub-protocol. The proposed protocol is more efficient compared with related protocols.

DOI: 10.24297/ijct.v10i1.3328

Related papers

Efficient and practical fair exchange protocols with off-line TTP

Feng Bao, Robert Huijie Deng, Wenbo Mao

We present protocols for fair exchange of electronic data (digital signatures, payment and confidential data) between two parties A and B. Novel properties of the proposed protocols include: 1) offline trusted third party (TTP), i.e., TTP does not take part in the exchange unless one of the parties behaves improperly; 2) only three message exchanges are required in the normal situation; 3) true fair exchange, i.e., either A and B obtain each other's data or no party receives anything useful; no loss can be incurred to a party no matter how maliciously the other party behaves during the exchange. This last property is in contrast to previously proposed protocols with offline TTP ([1] and [21]), where a misbehaving party may get another party's data while refusing to send his document to the other party, and the TTP can provide affidavits attesting to what happened during the exchange. To our knowledge, the protocols presented here are the first exchange protocols which use offline TTP and at the same time guarantee true fair exchange of digital messages. We introduce a novel cryptographic primitive, called the Certificate of Encrypted Message Being a Signature (CEMBS), as the basic building block of the fair exchange protocols. It is used to prove that an encrypted message is a certain party's signature on a public file, without revealing the signature. We also give two examples to show in detail how the certificate can be constructed.

IEEE Symposium on Security and Privacy (S&P)Nov 27, 2002295 citations

Extending a Key-Chain Based Certified Email Protocol with Transparent TTP

Zhiyuan Liu, Jun Pang, Chenyi Zhang

Cederquist et al. proposed an optimistic certified email protocol, which employs key chains to reduce the storage requirement of the trusted third party (TTP). We extend their protocol to satisfy the property of TTP transparency, using existing verifiably encrypted signature schemes. An implementation with the scheme based on bilinear pairing makes our extension one of the most efficient certified email protocols satisfying strong fairness, timeliness, and TTP transparency.

IEEE International Conference on Computational Science and Engineering (CSE) and IEEE International Conference on Embedded and Ubiquitous Computing (EUC)Dec 1, 201010 citations

An improved certified email protocol using an offline TTP

Ranadeep Mukherjee, Ambar Dutta

Certified email allows two parties to exchange a message while providing each party an evidence to prove the involvement of the other party in the exchange. This paper proposes a new certified email protocol which aims to improve an existing popular protocol. It does so by using an offline TTP and implementing “no author selective receipt”.

International Conference on Emerging Applications of Information TechnologyNov 1, 20121 citation

A New Protocol for Certified Mail Based on Off-line Conditional TTP

Shen Wei

Electronic mail delivery is one of the most important and desirable services, by which the intended recipient will get the mail if and only if the mail originator receives a valid and irrefutable proof of the receipt. The idea of conditional trusted third party has been developed on the basis of semi-trusted TTP and a suite of acceptable conditions is given. A new practical protocol for certified e-mail is presented, which can guarantee acceptable fair with interception of conditional TTP. More, the evidence in the new protocol is publicly verifiable without any restrictions on the type of signature and encryption algorithms.

Jisuanji gongchengJan 1, 20040 citations

Verifiable encryption of digital signatures and applications

Giuseppe Ateniese

This paper presents a new simple schemes for verifiable encryption of digital signatures. We make use of a trusted third party (TTP) but in an optimistic sense, that is, the TTP takes part in the protocol only if one user cheats or simply crashes. Our schemes can be used as primitives to build efficient fair exchange and certified e-mail protocols.

ACM Transactions on Information and System SecurityFeb 1, 200496 citations

Certified e-Mail Protocol with Verifiable Third Party

Macià Mut–Puigserver, Josep Lluís Ferrer Gomila, Llorenç Huguet Rotger

Certified e-mail is a particular case of fair exchange. TTPs play an important role in this kind of protocols and their reliability and security is a problem that needs to be addressed. In order to enhance the trust in non-repudiation services we propose TTPs that provide verifiable services, so users get evidence of the TTPs operations. In this paper we design a new certified e-mail protocol where the user confidence on what is happening when he invokes the TTP is enhanced.

IEEE Conference on Commerce and Enterprise Computing (CEC)Apr 12, 200512 citations