unveiled secret key的用法和樣例：
例句
- Users can make their public keys freely available or place them at a key distribution centre for others to access.
用戶可以讓公開密鑰自由使用或者把公開密鑰放在可由別人存取的密鑰分配中心。 - Conversely,plaintext encrypted with the private key can be decrypted only with the public key.
相反，用秘密密鑰加密的普通文本只能由公開密鑰解密。
