对称演算法需要建立金钥和初始化向量 （IV），而这两者必须对任何不应解密您资料的人保密。
Symmetric algorithms require the creation of a key and an initialization vector (IV) that must be kept secret from anyone who should not decrypt your data.
然后由接收应用程序负责使用对称金钥解密讯息。
It is then the responsibility of the receiving application to decrypt the message using the symmetric key.
字典攻击是攻击者借由使用先前计算的最可能金钥加密值与加密值进行比较，尝试将加密讯息解密的攻击。
A dictionary attack is an attack in which the attacker attempts to decrypt an encrypted message by comparing the encrypted value with previously computed encrypted values for the most likely keys.
字典攻击是攻击者借由使用先前计算的最可能金钥加密值与加密值进行比较，尝试将加密讯息解密的攻击。
A dictionary attack is an attack in which the attacker attempts to decrypt an encrypted message by comparing the encrypted value with previously computed encrypted values for the most likely keys.
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