新網絡營銷基礎與實踐

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            盲簽名

            在普通數字簽名中,簽名者總是先知道數據的內容后才實施簽名,這是通常的辦公事務所需要的。但有時卻需要某個人對某數據簽名,而又不能讓他知道數據的內容。稱這種簽名為盲簽名(BlindSignature)。在無記名投票選舉和數字貨幣系統中往往需要這種盲簽名。

            盲簽名與普通簽名相比有兩個顯著的特點:

            ①簽名者不知道所簽署的數據內容;

            ②在簽名被接收者泄露后,簽名者不能追蹤簽名。即:如果把簽名的數據給簽名者看,他確信是自己的簽名,但他無法知道什么時候對什么樣的盲數據施加簽名而得到此簽名數據。·盲簽名在電子商務和電子政務系統中有著廣泛的應用前景。

            具體步驟:

            ·接收者首先將待簽數據進行盲變換,把變換后的盲數據發給簽名者。

            ·經簽名者簽名后再發給接收者。

            ·接收者對簽名再作去盲變換,得出的便是簽名者對原數據的盲簽名。

            ·這樣便滿足了條件①。要滿足條件②,必須使簽名者事后看到盲簽名時不能與盲數據聯系起來,這通常是依靠某種協議來實現的。

            意義:盲簽名在某種程度上保護了參與者的利益,但不幸的是盲簽名的匿名性可能被犯罪份子所濫用。為了阻止這種濫用,人們又引入了公平盲簽名的概念。公平盲簽名比盲簽名增加了一個特性,即建立一個可信中心,通過可信中心的授權,簽名者可追蹤簽名。

             一般來說,一個好的盲簽名應該具有以下的性質:

              1. 不可偽造性。除了簽名者本人外,任何人都不能以他的名義生成有效的盲簽名。這是一條最基本的性質。

              2. 不可抵賴性。簽名者一旦簽署了某個消息,他無法否認自己對消息的簽名。

              3. 盲性。簽名者雖然對某個消息進行了簽名,但他不可能得到消息的具體內容。

              4. 不可跟蹤性。一旦消息的簽名公開后,簽名者不能確定自己何時簽署的這條消息。

              滿足上面幾條性質的盲簽名,被認為是安全的。這四條性質既是我們設計盲簽名所應遵循的標準,又是我們判斷盲簽名性能優劣的根據。

              另外,方案的可操作性和實現的效率也是我們設計盲簽名時必須考慮的重要

              因素。一個盲簽名的可操作性和實現速度取決于以下幾個方面:

              1. 密鑰的長度;

              2. 盲簽名的長度;

              3. 盲簽名的算法和驗證算法。

            網絡營銷詞典內容均由網友提供,僅供參考。

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