If it were an asymmetrical algorithm, it would use different keys for encryption and decryption. Since it’s a symmetric-key algorithm, it employs the same key in both encrypting and decrypting the data. The algorithm takes the plain text in 64-bit blocks and converts them into ciphertext using 48-bit keys. The DES (Data Encryption Standard) algorithm is a symmetric-key block cipher created in the early 1970s by an IBM team and adopted by the National Institute of Standards and Technology (NIST). What is the DES Algorithm in Cyber Security? For example, a 128-bit key requires 10 rounds, a 192-bit key requires 12 rounds, and so on. Depending upon the size of the key being used, the number of rounds varies. The DES process has several steps involved in it, where each step is called a round. Using this key, the DES takes a block of 64-bit plain text as input and generates a block of 64-bit cipher text. The DES algorithm uses a key of 56-bit size. There are certain machines that can be used to crack the DES algorithm.
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