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Update hash_algorithm.md (#836)

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* Update hash_algorithm.md

- Add the hiding property required for the hash algorithm in security domain.

* Update hash_algorithm.md

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Co-authored-by: Yudong Jin <krahets@163.com>
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docs/chapter_hashing/hash_algorithm.md
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@ -31,6 +31,7 @@ index = hash(key) % capacity
对于密码学的相关应用，为了防止从哈希值推导出原始密码等逆向工程，哈希算法需要具备更高等级的安全特性。 对于密码学的相关应用，为了防止从哈希值推导出原始密码等逆向工程，哈希算法需要具备更高等级的安全特性。
- **单向性**：无法通过哈希值反推出关于输入数据的任何信息。
- **抗碰撞性**：应当极其困难找到两个不同的输入，使得它们的哈希值相同。 - **抗碰撞性**：应当极其困难找到两个不同的输入，使得它们的哈希值相同。
- **雪崩效应**：输入的微小变化应当导致输出的显著且不可预测的变化。 - **雪崩效应**：输入的微小变化应当导致输出的显著且不可预测的变化。