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These schemes provide authentication, integrity and non-repudiation to digital communications. Some extensions or variations of the concept of digital signature have been introduced, and many specific realizations of these new types of nature schemes have been proposed. In this thesis, we deal with the basic definitions and required security properties of traditional signature schemes and two of its extensions: distributed signature schemes and ring signature schemes. We review the state of the art in these two topics; then we propose and analyze new specific schemes for different scenarios. Namely, we first study distributed signature schemes for general access structures, based on RSA; then we show that such schemes can be used to construct other cryptographic protocols: distributed key distribution schemes and metering schemes. With respect to ring signatures, we opose schemes for both a scenario where the keys are of the Discrete Logarithm type and a scenario where the public keys of users are inferred from their personal identities. Finally, we also propose some distributed ring signature schemes, a kind of schemes which combine the concepts of distributed signatures and ring signatures. We formally prove the security of all these proposals, assuming that some mathematical problems are hard to solve. 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In this paper we propose methods to construct some computationally secure distributed protocols from threshold signature schemes. Namely, we construct metering schemes from threshold non-interactive signature schemes. We also show that threshold deterministic signature schemes can be used to design distributed key distribution schemes. Furthermore, the constructed protocols attain some desirable properties and have useful applications on the Internet. 1", "publicationTitle": "", "publisher": "", "place": "", "date": "2008", "volume": "", "issue": "", "section": "", "partNumber": "", "partTitle": "", "pages": "", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "", "DOI": "", "citationKey": "", "url": "http://citeseerx.ist.psu.edu/viewdoc/summary?doi=?doi=10.1.1.118.6303", "accessDate": "", "PMID": "", "PMCID": "", "ISSN": "", "archive": "", "archiveLocation": "http://www.scientificcommons.org/42416270", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "0003", "rights": "", "extra": "", "tags": [], "collections": [], "relations": {}, "dateAdded": "2009-06-03T09:43:09Z", "dateModified": "2011-12-15T00:09:55Z" } }, { "key": "4N3EVJBH", "version": 1, "library": { "type": "group", "id": 1355, "name": "Distributed Security", "links": { "alternate": { "href": 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"firstName": "Alex A", "lastName": "Shvartsman" } ], "abstractNote": "", "series": "", "seriesNumber": "", "volume": "", "numberOfVolumes": "", "edition": "", "date": "2007", "publisher": "Springer-Verlag New York, Inc.", "place": "Secaucus, NJ, USA", "originalDate": "", "originalPublisher": "", "originalPlace": "", "format": "", "numPages": "", "ISBN": "0387309187", "DOI": "", "citationKey": "", "url": "", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "0003", "rights": "", "extra": "", "tags": [], "collections": [], "relations": {}, "dateAdded": "2009-08-21T11:35:57Z", "dateModified": "2011-12-15T00:09:54Z" } }, { "key": "2IGW8XI4", "version": 1, "library": { "type": "group", "id": 1355, "name": "Distributed Security", "links": { "alternate": { "href": "https://www.zotero.org/groups/distributed_security", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/1355/items/2IGW8XI4", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/distributed_security/items/2IGW8XI4", "type": "text/html" } }, "meta": { "createdByUser": { "id": 27252, "username": "relet", "name": "Thomas Hirsch", "links": { "alternate": { "href": "https://www.zotero.org/relet", "type": "text/html" } } }, "lastModifiedByUser": { "id": 315367, "username": "opscure", "name": "Matthew Dillon", "links": { "alternate": { "href": "https://www.zotero.org/opscure", "type": "text/html" } } }, "creatorSummary": "Gambetta", "parsedDate": "1988", "numChildren": 0 }, "data": { "key": "2IGW8XI4", "version": 1, "itemType": "conferencePaper", "title": "Can We Trust Trust?", "creators": [ { "creatorType": "author", "firstName": "Diego", "lastName": "Gambetta" } ], "abstractNote": "", "proceedingsTitle": "Trust: Making and Breaking Cooperative Relations", "conferenceName": "", "publisher": "Basil Blackwell", "place": "", "date": "1988", "eventPlace": "", "volume": "", "issue": "", "numberOfVolumes": "", "pages": "213–237", "series": "", "seriesNumber": "", "DOI": "", "ISBN": "", "citationKey": "", "url": "", "accessDate": "", "ISSN": "", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "0240", "rights": "", "extra": "", "tags": [], "collections": [], "relations": {}, "dateAdded": "2009-08-21T11:36:02Z", "dateModified": "2011-12-15T00:09:53Z" } }, { "key": "2F3Z9U8A", "version": 1, "library": { "type": "group", "id": 1355, "name": "Distributed Security", "links": { "alternate": { "href": "https://www.zotero.org/groups/distributed_security", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/1355/items/2F3Z9U8A", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/distributed_security/items/2F3Z9U8A", "type": "text/html" } }, "meta": { "createdByUser": { "id": 27252, "username": "relet", 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The process is fully self-managed by the nodes, without any trusted party. New nodes can join the network and are able to obtain the same capabilities as initial nodes; further, each node can obtain a pair of secret/public keys to secure and authenticate its communication. Two additional features of our system are that it allows to implement threshold operations (signature or decryption) involving subgroups of nodes in the network and that any subgroup with a small number of nodes (between 2 and 6) can obtain a common secret key without any communication after the set up phase.", "publicationTitle": "Computer Networks", "publisher": "", "place": "", "date": "12/2007", "volume": "51", "issue": "18", "section": "", "partNumber": "", "partTitle": "", "pages": "4938-4950", "series": "", "seriesTitle": "", "seriesText": "", "journalAbbreviation": "Computer Networks", "DOI": "10.1016/j.comnet.2007.08.002", "citationKey": "", "url": "http://linkinghub.elsevier.com/retrieve/pii/S1389128607002253", "accessDate": "", "PMID": "", "PMCID": "", "ISSN": "13891286", "archive": "", "archiveLocation": "", "shortTitle": "", "language": "", "libraryCatalog": "", "callNumber": "0006", "rights": "", "extra": "", "tags": [], "collections": [], "relations": {}, "dateAdded": "2009-06-03T09:27:02Z", "dateModified": "2011-12-15T00:09:52Z" } }, { "key": "GFDEAWTB", "version": 1, "library": { "type": "group", "id": 1355, "name": "Distributed Security", "links": { "alternate": { "href": "https://www.zotero.org/groups/distributed_security", "type": "text/html" } } }, "links": { "self": { "href": "https://api.zotero.org/groups/1355/items/GFDEAWTB", "type": "application/json" }, "alternate": { "href": "https://www.zotero.org/groups/distributed_security/items/GFDEAWTB", "type": "text/html" }, "up": { "href": "https://api.zotero.org/groups/1355/items/XH52UV2P", "type": "application/json" } }, "meta": { "createdByUser": { "id": 27252, "username": "relet", "name": "Thomas Hirsch", "links": { "alternate": { "href": "https://www.zotero.org/relet", "type": "text/html" } } }, "lastModifiedByUser": { "id": 315367, "username": "opscure", "name": "Matthew Dillon", "links": { "alternate": { "href": "https://www.zotero.org/opscure", "type": "text/html" } } }, "numChildren": 0 }, "data": { "key": "GFDEAWTB", "version": 1, "parentItem": "XH52UV2P", "itemType": "note", "note": "

including some \"Advances in Distributed Security\" from 2003.

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