Chaum’s idea was to break the linkage between the issuance and usage of a credential. This means that when Alice shows her credential to the website, all the site learns is that Alice has been given a valid credential. The site should not learn which issuance flow produced her the credential, which means it should not learn her exact ID; and this should hold even if the website colludes with (or literally is) the issuer of the credentials. The result is that, to the website, at least, Alice’s browsing can be unlinked from her identity. Imn other words, she can “hide” within the anonymity set of all users who obtained credentials.
Correction: An earlier version of this article incorrectly claimed that Frederick Sanger is the only individual to receive two Nobel Prizes in the same field. We apologize for the error.，推荐阅读Line官方版本下载获取更多信息
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Tommy Trenchard荷赛获奖作品“利文斯通的大象低语者” 供图 张海律