All official OMIs use keypairs as their authentication system. To connect to an instance launched from an official OMI, you need to use the keypair assigned to it during its creation. For more information, see Accessing Your Instances and About Keypairs.
Non-official OMIs can use any authentication system. To connect to an instance launched from a non-official OMI, you need to check with the provider of the OMI what system is used.
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