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--- abstract: |+ In this thesis, we propose some directed signature schemes. In addition, we have discussed their applications in different situations. In this thesis, we would like to discuss the security aspects during the design process of the proposed directed digital signature schemes. The security of the most digital signature schemes widely use in practice is based on the two difficult problems, viz; the problem of factoring integers (The RSA scheme) and the problem of finding discrete logarithms over finite fields (The ElGamal scheme). The proposed works in this thesis is divided into seven chapters. altloc: [] chapter: ~ commentary: ~ commref: ~ confdates: ~ conference: ~ confloc: ~ contact_email: ~ creators_id: - 5333 creators_name: - family: balyan given: Manoj honourific: Kumar lineage: raghuvanshi date: 2003-11 date_type: published datestamp: 2004-12-30 department: Dr. B.R.A. Uni Agra dir: disk0/00/00/40/13 edit_lock_since: ~ edit_lock_until: ~ edit_lock_user: ~ editors_id: [] editors_name: [] eprint_status: archive eprintid: 4013 fileinfo: /style/images/fileicons/application_pdf.png;/4013/1/Ph.D._Thesis__Manoj_Kuamr.pdf full_text_status: public importid: ~ institution: I.B.S. Khandri-AGRA isbn: ~ ispublished: unpub issn: ~ item_issues_comment: [] item_issues_count: 0 item_issues_description: [] item_issues_id: [] item_issues_reported_by: [] item_issues_resolved_by: [] item_issues_status: [] item_issues_timestamp: [] item_issues_type: [] keywords: 'cryptography,secret key cryptography,public key cryptography,authentication, digital signature ,proxy signature, threshold signature, directed signature schemes.' lastmod: 2011-03-11 08:55:49 latitude: ~ longitude: ~ metadata_visibility: show note: Some of the research papers related to this thesis may seen at arxiv.org number: ~ pagerange: ~ pubdom: TRUE publication: ~ publisher: ~ refereed: FALSE referencetext: ~ relation_type: [] relation_uri: [] reportno: ~ rev_number: 12 series: ~ source: ~ status_changed: 2007-09-12 16:55:05 subjects: - comp-sci-hci succeeds: ~ suggestions: ~ sword_depositor: ~ sword_slug: ~ thesistype: Ph.D. thesis title: 'A Thesis: A CRYPTOGRAPHIC STUDY OF SOME DIGITAL SIGNATURE SCHEMES.' type: thesis userid: 5333 volume: ~