NETWORK SECURITY
CONFIDENTIALITY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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block cipher
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stream cipher
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bit cipher
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byte cipher
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Detailed explanation-1: -The Data Encryption Standard is a block cipher, meaning a cryptographic key and algorithm are applied to a block of data simultaneously rather than one bit at a time. To encrypt a plaintext message, DES groups it into 64-bit blocks.
Detailed explanation-2: -For example, if we take the plaintext message “8787878787878787", and encrypt it with the DES key “0E329232EA6D0D73", we end up with the ciphertext “0000000000000000". If the ciphertext is decrypted with the same secret DES key “0E329232EA6D0D73", the result is the original plaintext “8787878787878787".
Detailed explanation-3: -The data encryption standard (DES) is a symmetric block cipher. A stream cipher operates on a digital data stream one or more bits at a time. A block cipher operates on complete blocks of data at any one time and produces a ciphertext block of equal size.
Detailed explanation-4: -The use of the DES algorithm was made mandatory for all financial transactions of the U.S. government involving electronic fund transfer, including those conducted by member banks of the Federal Reserve System.