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最理想的隱私保護智能合約應該能夠對除了提供它的人之外的所有人隱藏輸入數據,在不透露任何狀態的情況下執行任意計算,並按照程序規範返回輸出。目前能做到隱私保護智能合約的方式有以下三種:
1. 可信執行環境 (#TEE)

可信執行環境(#TEE) 是設備主處理器上與主操作系統分離的隔離區域。它確保數據在受信任的環境中存儲、處理和保護。迄今為止最流行的 TEE 是 Intel SGX,許多的 Intel 芯片都包含這個元件。
#TEE 對於計算機的所有者來說就是個黑盒。計算機的所有者無權查看其中的數據,這也就保證了加密數據不會被洩漏,但計算可以安全的進行。程序的狀態完全隱藏,任何人都無法訪問。使用這種方法的項目有 @SecretNetwork ($SCRT),@OasisLabs ($ROSE) 和 @PhalaNetwork ($PHA)。
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