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You can securely upload/download your data to Amazon S3 via SSL endpoints using the HTTPS protocol. If you need extra security you can use the Server Side Encryption (SSE) option or the Server Side Encryption with Customer-Provide Keys (SSE-C) option to encrypt data stored-at-rest. Amazon S3 provides the encryption technology for both SSE and SSE-C. Alternatively you can use your own encryption libraries to encrypt data before storing it in Amazon S3.
SSE-S3 provides an integrated solution where Amazon handles key management and key protection using multiple layers of security.
SSE-C enables you to leverage Amazon S3 to perform the encryption and decryption of your objects while retaining control of the keys used to encrypt objects.
SSE-KMS enables you to use AWS Key Management Service (AWS KMS) to manage your encryption keys. AWS KMS provides additional security controls to support customer efforts to comply with PCI-DSS, HIPAA/HITECH, and FedRAMP industry requirements.
With SSE, every protected object is encrypted with a unique key. This object key is itself encrypted by a separate master key. A new master key is issued at least monthly. Encrypted data, encryption keys and master keys are stored and secured on separate hosts for multiple layers of protection.
For example, for Amazon EC2, one of the following AWS managed policies might meet your needs:
Security groups enable you to control traffic to your instance, including the kind of traffic that can reach your instance. For example, you can allow computers from only your home network to access your instance using SSH. If your instance is a web server, you can allow all IP addresses to access your instance via HTTP, so that external users can browse the content on your web server.
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