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Cisco Cisco Email Security Appliance C170 Guia Do Utilizador

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19-21
Cisco AsyncOS 9.1 for Email User Guide
 
Chapter 19      S/MIME Security Services
  S/MIME Certificate Requirements
For detailed information about S/MIME certificates, see RFC 5750: Secure/Multipurpose Internet Mail 
Extensions (S/MIME) Version 3.2 - Certificate Handling.
Certificate Requirements for Encryption
The S/MIME certificate for encryption must contain the following information:
City (Locality)
The city where the organization is legally located.
State (Province)
The state, county, or region where the organization is legally located.
Country
The two letter ISO abbreviation of the country where the organization is 
legally located.
Duration before expiration
The number of days before the certificate expires.
Subject Alternative 
Name(Domains)
Name of the domain from which you plan to send signed messages. 
Examples include 
domain.com
 and 
*.domain.net
. For multiple entries, 
use a comma-separated list.
Subject Alternative 
Name(Email)
Email address of the user who is planning to send signed messages, for 
example, 
user@somedomain.com
. For multiple entries, use a 
comma-separated list.
Private Key Size
Size of the private key to generate for the CSR.
Key Usage
Key usage is a restriction method that determines what a certificate can be 
used for. If the key usage extension is specified, the following bits: 
digitalSignature
 and 
nonRepudiation
 must be set.
If the key usage extension is not specified, receiving clients must presume 
that the 
digitalSignature
 and 
nonRepudiation
 bits are set.
Common Name
The fully qualified domain name.
Organization
The exact legal name of the organization.
Organizational Unit
Section of the organization.
City (Locality)
The city where the organization is legally located.
State (Province)
The state, county, or region where the organization is legally located.
Country
The two letter ISO abbreviation of the country where the organization is 
legally located.
Duration before expiration
The number of days before the certificate expires.
Subject Alternative 
Name(Domains)
Name of the domain to which you plan to send encrypted messages. 
Examples include 
domain.com
 and 
*.domain.net
. For multiple entries, 
use a comma-separated list.
If you plan to send encrypted messages to all the users in a domain, the 
public key should include a SAN Domain.
Subject Alternative 
Name(Email)
Email address of the user to whom you plan to send encrypted messages, 
for example, 
user@somedomain.com
. For multiple entries, use a 
comma-separated list.