in this form of encryption algorithm, every Individual block contains 64-bit data, and three keys are used, where each key consists of 56 bits. Which is this encryption algorithm?

Question

Options

• AIDEA
• BTriple Data Encryption standard
• CMDS encryption algorithm
• DAES

• A
  6% (3)
• B
  90% (45)
• C
  4% (2)

Explanation

Triple DES (3DES) is correct because it processes data in 64-bit blocks and applies the standard DES algorithm three times using three separate 56-bit keys (totaling 168 bits of key material), which perfectly matches the description in the question. IDEA (A) is incorrect because it uses a single 128-bit key and also operates on 64-bit blocks, but does not use three 56-bit keys. MD5 (C) is not an encryption algorithm at all - it is a hashing algorithm used to verify data integrity, making it completely irrelevant here. AES (D) is incorrect because it uses block sizes of 128 bits and key sizes of 128, 192, or 256 bits - none of which match the described parameters.

Memory Tip: Think of Triple DES as "DES × 3" - the original DES used one 56-bit key on 64-bit blocks, so Triple DES simply applies that process three times with three keys, making it easy to remember the 3 × 56-bit key structure.

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