What is the Security methods(Authentication methods) available in sharepoint?

Authentication methods supported by SharePoint:

Classic-mode authentication methods

Anonymous
Basic
Digest
Certificates
NTLM
Negotiate (Kerberos or NTLM)

Claims-based authentication methods

Windows
Anonymous
Basic
Digest
Certificates
NTLM
Negotiate (Kerberos or NTLM)

Forms Based

LDAP
SQL Database or other databases
Custom or third party membership and role providers

SAML token-based authentication

Active directory federation services 2.0
Windows Live ID
Third-party identity providers