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Discussion

Find the false statement :

  • A.In Modern Cryptography, symmetric key algorithms use same key both for Encryption and Decryption.
  • B.The symmetric cipher DES (Data Encryption Standard) was widely used in the industry for security product.
  • C.The AES (Advanced Encryption Standard) cryptosystem allows variable key lengths of size 56 bits and 124 bits.
  • D.Public key algorithms use two different keys for Encryption and Decryption.

Answer: C

The false statement is the one about AES key lengths. The Advanced Encryption Standard supports fixed key lengths of 128, 192 and 256 bits, not variable lengths of 56 and 124 bits. The 56-bit key belongs to DES.

The other statements are true: symmetric algorithms use the same key to encrypt and decrypt, DES was widely used in security products, and public key algorithms use a different key for each of encryption and decryption.

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