CEH v9 Question of the Week: Block Cipher

Which of the following encryptions are not based on a block cipher?

A. AES (Rijndael)
B. DES
C. Blowfish
D. RC4

Reveal Answer

The correct answer is D.

RC4 (Rivest Cipher 4) is a stream cipher. In cryptography, a block cipher is a deterministic algorithm operating on fixed-length groups of bits, called blocks, with an unvarying transformation that is specified by a symmetric key. Block ciphers are important elementary components in the design of many cryptographic protocols, and are widely used to implement encryption of bulk data.

Notable block ciphers:

• Lucifer / DES
• IDEA
• RC5
• Rijndael / AES
• Blowfish

 

Related Course
Certified Ethical Hacker v9

CEH v9 Question of the Week Series

• CEH v9 Question of the Week: Retina Scanners
• CEH v9 Question of the Week: Employee Behavior
• CEH v9 Question of the Week: CVE-2007-2447
• CEH v9 Question of the Week: SQL Injection
• CEH v9 Question of the Week: Web Application Penetration Testing
• CEH v9 Question of the Week: iptables
• CEH v9 Question of the Week: Examine Streams of Packets
• CEH v9 Question of the Week: Scans
• CEH v9 Question of the Week: SQL Injection
• CEH v9 Question of the Week: Standard Risk Assessment
• CEH v9 Question of the Week: Penetration Testing
• CEH v9 Question of the Week: SMB Over TCP/IP
• CEH v9 Question of the Week: Block Cipher

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