> For the complete documentation index, see [llms.txt](https://docs.wem.io/platform/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://docs.wem.io/platform/wemreference/functions/security/aesiv.md).

# AesIv

{% hint style="info" %}
Generates a random Initialization Vector (IV) for use with `aesencrypt()` and `aesdecrypt()`.
{% endhint %}

{% hint style="success" %}
Returns a <mark style="color:$success;">`plaintext`</mark>
{% endhint %}

`aesiv()` produces a cryptographically random 16-byte (128-bit) Initialization Vector, returned as a base64-encoded text string. The IV ensures that identical plaintexts encrypted with the same key produce different ciphertexts, preventing pattern analysis attacks.

Together with `aeskey()`, the IV forms the two required inputs to the AES encryption system. The IV does not need to be secret, it is safe to store and transmit alongside the ciphertext, but it must be unique per encryption operation and must be passed to `aesdecrypt()` unchanged.

### Syntax

<details>

<summary>AesIV()</summary>

`AesIV()`

⇒ "d7133817026e13e7839df65dd7130eb7"

</details>

<details>

<summary>AesIV() use for MFA</summary>

The `AesIV()` result is assigned to the field `[Users.MfaVector]`  in a previous assignment. \
`AesEncrypt()` is used to encrypt and assign the users secret to the `[Users.MFASecret]` field

```
AesEncrypt([Authentication.Mfa.TempmfaSecret]
                    ,[System.MfaKey]
                    ,[Users.Mfa.MfaVector])
```

The result is now together with the `vector` stored in the Users database list, and can then together be used to for the creation of 2fa codes. [You can find more information about 2fa here.](/platform/wemtipsandtricks/security/2fa-with-totp.md)

</details>

### Parameters

| Parameter | Type | Description                        |
| --------- | ---- | ---------------------------------- |
| —         |      | This function takes no parameters. |


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