Practice Quiz

CompTIA Security+ Exam Prep

Category - Engineering

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Jeff keeps trying to successfully attack against an algorithm that has yet to be successfully attacked. What algorithm is Jeff attempting to attack?
  1. Blowfish
  2. International Data Encryption Algorithm (IDEA)
  3. RC4
  4. RC6
Explanation
Answer: B - The International Data Encryption Algorithm (IDEA) has yet to be successfully attacked. The IDEA is a bloc cipher and operates on 64-bit blocks of data. The 64-bit data block is divided into 16 smaller blocks and each has eight rounds of mathematical functions performed on it. The key is 128 bits long and IDEA is faster than DES when implemented in software. IDEA is used in the PGP and other encryption software implementations. It was through to replace DES, but it is patented, meaning that licensing fees would have to be paid to use it.
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