# String encryption

Source: https://hashisoft.com/docs/dashboard/strings/introduction

Protect string constants

Select a decoder backend and a protection profile for strings in your application. String protection is independent of call routing and arithmetic mutation.

## Configuration

These entries belong in the `engine` block of your RR configuration.

```rr
engine ^ {
  skipString false;
  nativeStringVault false;
  stringProtectionBackend "java-heterogeneous";
}
```

## Choose a backend and profile

Use java-heterogeneous for Java decoders or legacy for the older backend. Normal, Strong and Critical select different protection profiles. Higher settings can add work during startup and string decoding.

Native profiles are not supported by the remote Java worker.

## Option reference

For options beginning with `skip`, `false` enables the pass.

### String Encryption

boolean

`skipString`

Protects string constants. Enabled exports skipString false. Disabling it also disables enhanced string protection.

Panel default `false`

### Enhanced String Encryption

boolean

`nativeStringVault`

Selects the native string vault and enables Native VM. A matching native target and runtime are required.

Panel default `false`

### Encryption Backend

enum

`stringProtectionBackend`

Java uses heterogeneous Java decoders. Legacy selects the older backend. Native requires Native VM and the string vault.

Panel default `java-heterogeneous`Values `java-heterogeneous · legacy · native`

### Encryption Level

enum

`stringProtectionProfile`

Selects Normal, Strong or Critical string protection. Test startup time and string-heavy code with the selected profile.

Panel default `strong`Values `normal · strong · critical`

### Preserved class strings

boolean

`encryptPreservedClassStrings`

Allows string transformations in classes whose names are preserved. Check reflection and framework integrations.

Panel default `false`

## Related guides

[RR configurations ](https://hashisoft.com/docs/configurations)[Submit a build ](https://hashisoft.com/docs/quickstart)