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Secrets Manager

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Meant to store secrets (Passwords, API keys) , can rotate every X days using Lambda

works with DB’s (RDS, Dynamo) , CloudFormation and more

can control access to secrets (cross account) using Resource based policy

(more expensive than parameter store , auto rotation , must use KMS)

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to share secrets cross accounts - use resource base policy to allow encryption and decritption

Dynamic references: specify external values that are stored and managed in other services, such as the Parameter Store, in your stack templates. When you use a dynamic reference, CloudFormation retrieves the value of the specified reference when necessary during stack and change set operations.