【单选题】【消耗次数：1】
在密码学中，对RSA的描述是正确的是？
①
RSA是秘密密钥算法和对称密钥算法
②
RSA是非对称密钥算法和公钥算法
③
RSA是秘密密钥算法和非对称密钥算法
④
RSA是公钥算法和对称密钥算法
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