The statement accurately describes the cryptographic trust model underlying SAML federation. In a typical SAML configuration, the Identity Provider (IdP) authenticates the user and issues a SAML assertion. The Service Provider (SP) validates the assertion, particularly its digital signature, by using certificate/public-key information associated with the trusted IdP. Private keys remain protected by their owners; the corresponding certificates containing public keys can be exchanged through configuration or SAML metadata.

For Identity Security Cloud operating as a SAML Service Provider, SailPoint requires administrators to obtain the IdP's signing certificate and configure it in Identity Security Cloud. SailPoint also provides Service Provider metadata that can be supplied to the IdP. This establishes the federation relationship and allows the participating systems to validate SAML messages according to the configured trust model. The critical concept is that passwords are not shared between the IdP and SP. Authentication assertions are trusted because they originate from an established federation partner and can be cryptographically validated.

Study Guide Reference: Access Management — Authentication Methods, SAML Federation, Identity Provider and Service Provider Trust.

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