# Infrastructure Security in Network Flow Monitor
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As a managed service, Network Flow Monitor is protected by the Amazon global network security procedures that are described in the [Amazon Web Services: Overview of Security Processes](https://d0.awsstatic.com/whitepapers/Security/AWS_Security_Whitepaper.pdf) whitepaper.

You use Amazon published API calls to access Network Flow Monitor through the network. Clients must support Transport Layer Security (TLS) 1.0 or later. We recommend TLS 1.2 or later. Clients must also support cipher suites with perfect forward secrecy (PFS) such as DHE (Ephemeral Diffie-Hellman) or ECDHE (Elliptic Curve Ephemeral Diffie-Hellman). Most modern systems such as Java 7 and later support these modes.

Additionally, requests must be signed by using an access key ID and a secret access key that is associated with an IAM principal. Or you can use the [Amazon Security Token Service](https://docs.amazonaws.cn/STS/latest/APIReference/Welcome.html) (Amazon STS) to generate temporary security credentials to sign requests.