Question: 19&22 Suppose that has obtained a certificate from certification authority Xt and has obtained certificate authority from CAXA can use a chain of certificates to

19&22  19&22 Suppose that has obtained a certificate from certification authority Xt
and has obtained certificate authority from CAXA can use a chain of

Suppose that has obtained a certificate from certification authority Xt and has obtained certificate authority from CAXA can use a chain of certificates to obtain public key. In notation of X.509, this chain is represented in the correct order as a X21 A X signs the certificate for user Y with X's public key. B X signs the certificate for user Y with X's private key Y signs the certificate for user X with Y's public key. Y signs the certificate for user X with Y's private key

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