# Infrastructure security in Amazon Certificate Manager
<a name="infrastructure-security"></a>

As a managed service, Amazon Certificate Manager is protected by Amazon global network security. For information about Amazon security services and how Amazon protects infrastructure, see [Amazon Cloud Security](https://www.amazonaws.cn/security/). To design your Amazon environment using the best practices for infrastructure security, see [Infrastructure Protection](https://docs.amazonaws.cn/wellarchitected/latest/security-pillar/infrastructure-protection.html) in *Security Pillar Amazon Well‐Architected Framework*.

You use Amazon published API calls to access ACM through the network. Clients must support the following:
+ Transport Layer Security (TLS). We require TLS 1.2 and recommend TLS 1.3.
+ 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.

## Granting programmative access to ACM
<a name="programmatic-access"></a>

Users need programmatic access if they want to interact with Amazon outside of the Amazon Web Services Management Console. The Amazon APIs and the Amazon Command Line Interface require access keys. Whenever possible, create temporary credentials that consist of an access key ID, a secret access key, and a security token that indicates when the credentials expire.

To grant users programmatic access, choose one of the following options.


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| Which user needs programmatic access? | To | By | 
| --- | --- | --- | 
| IAM | Use short-term credentials to sign programmatic requests to the Amazon CLI or Amazon APIs (directly or by using the Amazon SDKs). | Following the instructions in [Using temporary credentials with Amazon resources](https://docs.amazonaws.cn//IAM/latest/UserGuide/id_credentials_temp_use-resources.html) in the IAM User Guide. | 
| IAM | (Not recommended)Use long-term credentials to sign programmatic requests to the Amazon CLI or Amazon APIs (directly or by using the Amazon SDKs). | Following the instructions in [Managing access keys for IAM users](https://docs.amazonaws.cn//IAM/latest/UserGuide/id_credentials_access-keys.html) in the IAM User Guide. |