> For the complete documentation index, see [llms.txt](https://docs.payments.thalescloud.io/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.payments.thalescloud.io/xpay-enablement/ja/apirifarensu/sekyuriti.md).

# セキュリティ

API は異なるセキュリティ層に依存しています：

* トランスポートレベルでは、TLS 相互認証が使用されます。
* アプリケーションレベルでは：
  * 機密性の高いカード情報（PAN）は PKCS#7 形式（RFC 2315/5652）で暗号化されます。
  * データ準備およびパーソナライズに使用されるデータ要素は、共通鍵暗号（対称鍵暗号）を使用して暗号化されます。


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# Agent Instructions
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## Querying This Documentation
If you need additional information that is not directly available in this page, you can query the documentation dynamically by asking a question.

Perform an HTTP GET request on the current page URL with the `ask` query parameter, and the optional `goal` query parameter:

```
GET https://docs.payments.thalescloud.io/xpay-enablement/ja/apirifarensu/sekyuriti.md?ask=<question>&goal=<endgoal>
```

`ask` is the immediate question: it should be specific, self-contained, and written in natural language.
`goal` is optional and describes the broader end goal you are ultimately trying to accomplish on behalf of the user. GitBook uses it to tailor the answer towards what is most useful for that goal.

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Use this mechanism when the answer is not explicitly present in the current page, you need clarification or additional context, or you want to retrieve related documentation sections.