TAILIEUCHUNG - A Scheme for obtaining a Warrant Message from the Digital Proxy Signatures

In this paper we propose a new type of digital proxy signature scheme in which the warrant message can be recovered from the proxy signature. | A Scheme for obtaining a Warrant Message from the Digital Proxy Signatures Sunder Lal and Amit Kumar Awasthi Institute of Basic Sciences Khandari Agra - 282002 UP INDIA Hindustan College of Science and Technology Farah Mathura - 281122 UP INDIA Email awasthi_hcst@ ABSTRACT Mambo et al 6-7 introduced a proxy signature scheme. Neuman 8 extended the scheme for delegation by warrant which was further extended by Kim et al 4 to partial delegation with a warrant. In this paper we propose a new type of digital proxy signature scheme in which the warrant message can be recovered from the proxy signature. In this scheme the warrant message is conveyed within the proxy signature and recovered by the verifier . the warrant need not be hashed or sent along with the proxy signature. It saves both communication bandwidth and storage space. Keywords Proxy signature Warrant message Message recovery Hash function INTRODUCTION Mambo et al. 6-7 developed a systematic approach to proxy or delegated signatures. Neuman 8 introduced the scheme for delegation by warrant which was further extended by Kim et al 4 to partial delegation by warrant. Till now we have the following types of delegations in literature - Full delegation - This happens when the original signer Alice gives its private key xAlicẻ to the proxy signer Bob. In this case a proxy signature by Bob is indistinguishable from the original signature of Alice. Partial delegation - This happens when the original signer Alice computes a proxy key Ơ from her private key xAlice and gives it to the proxy signer in a secure way. In this case the proxy signature by Bob is distinguishable from the original signature created by Alice. Delegation by warrant - warrant is a certificate composed of a message part that the proxy signer is authorised to sign and a public key which ensures the involvement of original signer. Partial delegation with warrant - in this delegation proxy key is computed by original signer Alice s private

• An ninh - Bảo mật
• Digital Proxy Signatures
• A Scheme for obtaining
• The Security discussion
• Institute of Basic Sciences
• The hash function
• The proxy signature
• Signature Clause
• Resolving Disputes
• Partnership Agreement
• Stock Agreement
• Shareholder Proxy