The main standards used by firms to send security assertions to one another is LDAP.

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LDAP is a protocol used for accessing and maintaining distributed directory information services over an Internet Protocol (IP) network. While LDAP can be used for authentication and authorization, it is not a standard for sending security assertions between firms. Other protocols and standards, such as SAML (Security Assertion Markup Language), are commonly used for this purpose.

The Main Standards Used by Firms to Send Security Assertions