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If the number is 1, the CA has a maximum of 1 subordinate CA between itself and an End-Entity in the certification paths. This field must be critical. Name constraints (NameConstraints) Name constraints are also used for a CA certificate and designates which naming patterns are acceptable in its subordinate name space. This constraint is applicable to the certificate subject name, that is, the subject’s distinguished name (DN) and subject alternative name in the certificate extension. For example, a CA with NameConstraints as ou=abc,o=ibm,c=us will issue certificates for End-Entities whose subject DN is cn=mike smith, ou=abc,o=ibm,c=us but will not be able to issue certificates for another End-Entity whose DN is cn=ken brown,ou=xyz,o=ibm,c=us.

If an End-Entity needs to communicate with other end-entities, it surely needs a certificate signed by a CA. The End-Entity has to enroll to the CA by filling in some registration forms specifying his or her own information. The information submitted will be used by the CA to identify if this End-Entity is real and should be granted a certificate. Also, the End-Entity (or sometimes the CA) will generate a key pair and send the public key to the CA. The CA will put this public key into the certificate if this End-Entity is eligible to get the certificate.

Principles of operation 43 Sender Receiver Network 4 Hash Algorithm Hash Algorithm 1 5 Hash Hash 2 7 MATCH? Sender’s Private Key Encryption Hash 3 6 Encrypted Hash (Digital Signature) Encrypted Hash Sender’s Public Key Figure 13. Digitally signing a message Figure 13 describes how a digital signature is used in practice. The following steps describe the process (the numbers correspond to the numbers in the figure): 1. The sender hashes the message to be sent. Common hashing algorithms produce either a 128-bit or 168-bit hash.

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