As a managed service, Amazon SNS is protected by the AWS global network security
procedures found in the Best Practices for
Security, Identity, & Compliance
Use AWS API actions to access Amazon SNS through the network. Clients must support Transport Layer Security (TLS) 1.2 or later. Clients must also support cipher suites with Perfect Forward Secrecy (PFS), such as Ephemeral Diffie-Hellman (DHE) or Elliptic Curve Ephemeral Diffie-Hellman (ECDHE).
You must sign requests using both an access key ID and a secret access key associated with an IAM principal. Alternatively, you can use the AWS Security Token Service (AWS STS) to generate temporary security credentials for signing requests.
You can call these API actions from any network location, but Amazon SNS supports resource-based access policies, which can include restrictions based on the source IP address. You can also use Amazon SNS policies to control access from specific Amazon VPC endpoints or specific VPCs. This effectively isolates network access to a given Amazon SNS topic from only the specific VPC within the AWS network. For more information, see Restrict publication to an Amazon SNS topic only from a specific VPC endpoint.
