1# OpenHarmony Verified Boot<a name="ZH-CN_TOPIC_0000001129033057"></a>
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3## Introduction<a name="section469617221261"></a>
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5Open**H**armony **V**erified **B**oot (HVB) component is used to verify and authenticate system images to make sure OpenHarmony is running system images:
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7- from authenticated sources
8- without tampering
9- can not roll back to old versions with vulnerabilities
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11![](figures/usage-en.png)
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15HVB is composed of three modules as shown below：
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17![](figures/hvb-arch.png)
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19- libhvb is the verifying utility library. It will be integrated by Bootloader to verify initial images, and integrated by init to verify system images.
20- hvbtool is used to sign system images, it will be integrated by Building system.
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24## Directory Structure<a name="section15884114210197"></a>
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26The structure of the repository directory is as follows:
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28```
29base/startup/hvb/
30├── libhvb         # source code for libhvb module
31└── tools          # source code for hvbtool module
32```
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36##  Repositories Involved<a name="section641143415335"></a>
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38**[startup\_init\_lite](https://gitee.com/openharmony/startup_init_lite)**
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