---
title: RSA with no padding is insecure
description: Datadog, the leading service for cloud-scale monitoring.
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  Docs > Datadog Security > Code Security > Static Code Analysis (SAST) > SAST
  Rules > RSA with no padding is insecure
---

# RSA with no padding is insecure

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## Metadata{% #metadata %}

**ID:** `java-security/no-rsa-no-padding`

**Language:** Java

**Severity:** Error

**Category:** Security

**CWE**: [780](https://cwe.mitre.org/data/definitions/780.html)

## Description{% #description %}

You should never use RSA without padding. RSA should always be used with some padding to prevent any weak encryption.

#### Learn More{% #learn-more %}

- [RSA with no padding is insecure](https://find-sec-bugs.github.io/bugs.htm#RSA_NO_PADDING)
- [CWE-780: Use of RSA Algorithm without OAEP](https://cwe.mitre.org/data/definitions/780.html)

## Non-Compliant Code Examples{% #non-compliant-code-examples %}

```java
class MyClass {

    public void test1() {
        Cipher c = Cipher.getInstance("RSA/NONE/NoPadding");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        byte[] cipherText = c.doFinal(plainText);
    }

    public void test2() {
        Cipher c = javax.crypto.Cipher.getInstance("RSA/NONE/NoPadding");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        byte[] cipherText = c.doFinal(plainText);
    }
}
```

## Compliant Code Examples{% #compliant-code-examples %}

```java
class MyClass {

    public void test() {
        Cipher c = Cipher.getInstance("RSA/ECB/OAEPWithMD5AndMGF1Padding");
        c.init(Cipher.ENCRYPT_MODE, k, iv);
        byte[] cipherText = c.doFinal(plainText);
    }


}
```
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