Cryptography
Symetric
AES
AES - ECB Mode

AES - ECB Mode

AES Electronic CodeBook is the most basic mode of operation. Each block is encrypted independently of the others. This is considered unsecure for most applications.

Definition

ECB Encryption ECB Encryption ECB Decryption ECB Decryption

Attacks

  • ECB Encryption Oracle padded with secret - CryptoHack

    To leak the secret, we can use the fact that ECB mode is stateless. We can compare the output of a block containing one unknown byte of the secret with all 256 possible outputs. The block that encrypts to the correct output is the one that contains the unknown byte.

  • ECB Decryption Oracle - CryptoHack

    A ECB decryption oracle can simply be used as an AES block decoder. Many modes can be compromised by this oracle.