假设有证书发放机构I1，I2，用户A在I1获取证书，用户B在I2获取证书，I1和I2已交换了各自的公钥。如果用I1《A》表示由I1颁发给A的证书，A可通过（）证书链接获取B的公开密钥。
- A.I1《I2》I2《B》
- B.I2《B》I1《I2》
- C.I1《B》I2《I2》
- D.I2《I1》I2《B》
正确答案及解析
正确答案
解析
证书规定有一个统一的第三方CA，即要求交换各自的公钥，而获取双方公钥的过程可理解为证书的验证过程，即双方证书是否有效，签名是否可靠，在证书A机构验证提取自己的信息，到证书B机构验证获取对方的信息。验证证书的可靠性是在当地发证机构进行，因此A的有效性需要在I1验证，并从I2机构获取B的信息，由于已经给出了I1颁发给A的证书为I2《A》，同时验证需要在I1机构进行，即I1《I2》，这里的I2不是指机构，而是证书I2《A》，《A》为A的公钥等信息，主要是证明A的身份可靠性。而获取B的信息需需要在I2机构验证进行，因此为I2《B》，《B》为B用户的公钥等信息。
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