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Suppose that A has obtained a certificate from certification authority X1 and B has obtained certificate authority from CA X2. A can use a chain of certificates to obtain B’s public key. In notation of X.509, this chain is represented in the correct order as –(a) X2 X1 X1 B(b) X1 X1 X2 A(c) X1 X2 X2 B(d) X1 X2 X2 AThe question was asked in a job interview.My question is taken from Public Keys and X.509 Certificates-II topic in division Message Authentication Codes, Whirlpool Algorithm and Key Management and Distribution of Cryptograph & Network Security

Answer»

Right option is (C) X1 X2 X2 B

For explanation: The CORRECT REPRESENTATION would be X1 X2 X2 B.



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