Question: Compare and contrast DES and AES.

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Comparison | DES | AES |
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Basic | In DES the data block is divided into two halves | In AES the entire data block is processed as a single matrix |

Principle | DES work on Feistal Cipher Structure | AES works substitution & fermutation principle |

Plain text | Plaintext is of 64 bits | Plaintext can be of 128, 192, 256 bits |

Key size | DES in comparison to AES has smaller key size | AES has larger by size as compared to DES |

Rounds | 16 rounds | 10 rounds for 128 bits, 12 rounds for 192 bits, 14 rounds for 256 bits |

Rounds names | Expansions fermutation Xor, S-box,P-box,Xor and Swap | Subtypes, Shiftonce , Mix columns , Addroundkeys |

Security | DES has a smaller key which is less secure | AES har larger secret key comparatively hence more secure. |

Speed | DES is slower | AES is faster |

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