1. #password hash synchronization (most simple)
*** Azure AD Connect synchronizes a hash, of the hash, of a user's password from an on-premises Active Directory instance to a cloud-based Azure AD instance.
*** You can use this feature to sign in to Azure AD services like Microsoft 365. You sign in to the service by using the same password you use to sign in to your on-premises Active Directory instance.
To use password hash synchronization in your environment, you need to:
-Install Azure AD Connect.
-Configure directory synchronization between your on-premises Active Directory instance and your Azure Active Directory instance.
-Enable password hash synchronization.
*** You can use this feature to sign in to Azure AD services like Microsoft 365. You sign in to the service by using the same password you use to sign in to your on-premises Active Directory instance.
To use password hash synchronization in your environment, you need to:
-Install Azure AD Connect.
-Configure directory synchronization between your on-premises Active Directory instance and your Azure Active Directory instance.
-Enable password hash synchronization.
## Password Hashing
**Hashing performs a one-way transformation on a password, turning the password into another String, called the hashed password. “One-way” means that it is practically impossible to go the other way - to turn the hashed password back into the original password.
2. ## Azure Active Directory Pass-through Authentication
**Azure Active Directory (Azure AD) Pass-through Authentication allows your users to sign in to both on-premises and cloud-based applications using the same passwords.
-When users sign in using Azure AD, this feature validates users' passwords directly against your on-premises Active Directory.
**-certain organizations wanting to enforce their on-premises Active Directory security and password policies, can choose to use Pass-through Authentication instead.
-Simply needs just a lightweight agent (makes only outbound connections) to be installed on-premises.
***-On-premises passwords are never stored in the cloud in any form.
-The communication between an agent and Azure AD is secured using certificate-based authentication. These certificates are automatically renewed every few months by Azure AD.
**Azure Active Directory (Azure AD) Pass-through Authentication allows your users to sign in to both on-premises and cloud-based applications using the same passwords.
-When users sign in using Azure AD, this feature validates users' passwords directly against your on-premises Active Directory.
**-certain organizations wanting to enforce their on-premises Active Directory security and password policies, can choose to use Pass-through Authentication instead.
-Simply needs just a lightweight agent (makes only outbound connections) to be installed on-premises.
***-On-premises passwords are never stored in the cloud in any form.
-The communication between an agent and Azure AD is secured using certificate-based authentication. These certificates are automatically renewed every few months by Azure AD.
**-Password Remains in On-Premise (Sync user ID only, not password).
3. ADFS
-Password Remains in On-Premise.
Azure AD can be the initial Azure AD managed domain. Azure AD can also be an on-premises Active Directory Domain Services that is federated with the Azure AD.
Azure Active Directory (AAD)
Azure Active Directory Domain Services (AADDS)
Active Directory (AD)
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