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# AWS::EC2::VPNConnection Phase2EncryptionAlgorithmsRequestListValue

Specifies the encryption algorithm for the VPN tunnel for phase 2 IKE negotiations.
## Syntax

To declare this entity in your CloudFormation template, use the following syntax:
### JSON

```
{
 "[Value](#cfn-ec2-vpnconnection-phase2encryptionalgorithmsrequestlistvalue-value)" : {{String}}
}
```
### YAML

```
 [Value](#cfn-ec2-vpnconnection-phase2encryptionalgorithmsrequestlistvalue-value): {{String}}
```
## Properties

`Value` 
The encryption algorithm. 
*Required*: No 
*Type*: String 
*Allowed values*: `AES128 | AES256 | AES128-GCM-16 | AES256-GCM-16` 
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