> For the complete documentation index, see [llms.txt](https://mysther.gitbook.io/knowledge-base/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://mysther.gitbook.io/knowledge-base/criptografia/padding-oracle-attack.md).

# Padding Oracle Attack

As cifras de bloco criptografa dados apenas em blocos de determinados tamanhos. Para identificarmos esse hash, devemos nos atentar aos seguintes pontos:

* Os valores são bem aleatórios não parecendo ter lógica alguma  
* Um block cipher é usado. O comprimento do texto cifrado decodificado (geralmente em Base64) é um múltiplo de tamanhos comuns de blocos de cifra, como 8 ou 16 bytes. 

#### Crypt

```
padbuster <url> <chave_criptogtafada> 8 --cookies <cookie> --encoding 0 -plaintext <string_a_sera_criptografada>
```

#### Decrypt

```
padbuster <url> <chave_criptogtafada> 8 --cookies <cookie> --encoding 0
```

#### Sites

```
# Explicação sobre Padding Oracle Attack
https://www.owasp.org/index.php/Testing_for_Padding_Oracle_(OTG-CRYPST-002)
```


---

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