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Advanced Infrastructure Penetration Testing by Chiheb Chebbi

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Symmetric cryptosystem

The various types of symmetric cryptosystems are as follows:

  • Data Encryption Standard (DES): This has been developed by IBM. It started as Lucifer encryption and was later published by the National Institute of Standards and Technology (NIST). This encryption uses a 56-bit key:

The round function is described in the following workflow:

The key generation is done using the following workflow:

The initial and final permutations ...

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