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Update padding-oracle-priv.md

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Carlos Polop 2021-10-20 09:58:25 +01:00 committed by GitHub
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cryptography/padding-oracle-priv.md
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In CBC mode the **previous encrypted block is used as IV **to XOR with the next block:
![CBC encryption](https://assets.pentesterlab.com/padding_oracle/CBC_encryption.png)
![CBC encryption](https://defuse.ca/images/cbc_encryption.png)
To decrypt CBC the **opposite** **operations** are done:
![CBC decryption](https://assets.pentesterlab.com/padding_oracle/CBC_decryption.png)
![CBC decryption](https://defuse.ca/images/cbc_decryption.png)
Notice how it's needed to use an **encryption** **key** and an **IV**.