Data Encryption Standard is a standard encryption algorithm used to encrypt and decrypt electronic data. It was developed during 1970’s in the United States by IBM and submitted to a request for proposal floated by National Bureau of Standards (NBS) to protect official government data.
The algorithm used for encryption is available in public, but the key used is secret. The method processes 64 bit block of data at a time. The DES works on the basis of the Fiestel block cipher in the following way:
In DES, the same key is used for both encryption as well as decryption. Hence it is a symmetric type method.
However after the development of DES, lot of issues regarding the security of the application came up due to the small size of the secret key. Now the DES has been replaced with AES (Advanced Encryption Standard).
Hence, this concludes the definition of Data Encryption Standard DES along with its overview.
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