题目内容

假设使用一和加密算法，它的加密方法很简单，将每一个字母加5，即a加密成f，b加密成g,这种算法的密钥就是5，那么它属于______。

A. 对称密码技术
B. 分组密码技术
C. 公钥密码技术
D. 单向函数技术

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