3i Infotech Placement: Sample Questions 946 - 947 of 1245

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Question 946

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Describe in Detail

Essay▾

Expand IDEA.

Explanation

  • International Data Encryption Algorithm.
  • Uses a block cipher with a 128-bit key.
  • Considered among the best publicly known algorithms.
  • Patented in the United State and in most of the European countries.
  • Provides good privacy
  • Incorporated after the original cipher used was v1.0, BassOmatic.
  • Entirely avoids use of any lookup tables or S-boxes.
  • Divides data into four quarters, each 16 bits long- combination of two 16 bit values produces a 16-bit result through addition, XOR and multiplication.

Question 947

Edit

Describe in Detail

Essay▾

What is Domain-Key Normal Form?

Explanation

Define Domain-Key Normal Form

Definition:

  • Domain-key normal form (DKNF) is a normal form, it is used in database normalization
  • Requires no constraints other than domain constraints and key constraints.
  • Example is Boyce-Codd normal form (BCNF) , fourth normal form, and fifth normal form
  • Avoids having general constraints in the database.
  • All database constraints simply check all attribute values in a tuple form are of the appropriate domain and that every key constraint is enforced.
  • While the domain-key normal form eliminates the problems found in most databases, it tends to be the most costly normal form to achieve.

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