|
Publius is (was?) a web protocol developed by (Waldman ), Rubin & (Cranor ) for allowing individuals the ability to publish information on the web anonymously and with a high guarantee that their publications will not be censored or modified by a third party. The nine design goals of the Publius development team are: *''Censorship resistance'' - decreasing the chance that a third party will manage to modify or delete the published materials. *''Tamper evident'' - unauthorized changes are traceable. *''Source Anonymous'' - there is no way to tell who published the material once it is available on the web. *''Updatable'' - publishers are allowed to modify or delete their material. *''Deniable'' - third parties participating in publishing the materials lacks the responsibility for the hosted content. *''Fault tolerant'' - system should function even when some involved third parties are faulty or malicious. *''Persistent'' - there is no expiration date for published materials. *''Extensible'' - support for future protocol extensions or growth in the number of publishers. *''Freely available'' - all software tools required for the system should be out of charge. ==Overview== The Publius web system consists of the following agents: *''Publishers'' - participants who publish their contents on the web. *''Servers'' - which host the publishers' contents on the web (considered as part of the third parties). *''Retrievers'' - participants who browse the web contents published by the publishers. The Publius system relies on a static list of ''m'' web servers. When a publisher wishes to add a contents ''M'' to the web, it first encrypts ''M'' using some random symmetric key ''K''. Then ''K'' is split into ''n'' shares (parts) where at least ''k''<''n'' shares are required for the reconstruction of ''K'' (see also Secret sharing). A subset of the ''m'' servers receives another share of ''K'' and the encryption result of ''M'' using the key ''K'', ''E(M,K)''. When a retriever wishes to obtain the original contents ''M'', it follows a generated URL which corresponds to the contents ''M'' combined with the portion of ''K'' as it appears on a subset of servers from the list. Gathering ''k'' different shares and a copy of ''E(M,K)'' allows the retriever to reconstruct the key ''K'' out of the shares and decrypt ''E(M,K)'' back into ''M''. Modification or removal of the server hosted contents can be issued only by the original publishers using a combination of password and the hosting server domain name. At present, Publius supports the hosting of HTML pages, images and other file formats such as PDFs and PostScripts. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Publius Publishing System」の詳細全文を読む スポンサード リンク
|