# 312-50v13 — Question 424

**Type:** multiple_choice
**Topics:** topic_1

## Question

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?

## Correct Answer

_See scenario._

## Explanation

Selected Answer: B
Characteristics of Triple DES (3DES).

-- It operates on 64-bit blocks of data.
-- It uses three 56-bit keys (K1, K2, and K3), effectively providing a key length of up to 168 bits.
-- The encryption process involves three operations: encrypting with K1, decrypting with K2, and encrypting again with K3 (Encrypt-Decrypt-Encrypt or EDE mode).

**Reference:** examtopics_top_comment

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Source: https://hiexam.net/q/eccouncil/312-50v13/424  
Practice (tracked): https://hiexam.net/study/312-50v13/practice