Which of the following algorithms is a stream cipher?
RC2
RC4
RC5
RC6
RC2, RC4, RC5 and RC6 were developed by Ronal Rivest from RSA Security.
In the RC family only RC4 is a stream cipher.
RC4 allows a variable key length.
RC2 works with 64-bit blocks and variable key lengths,
RC5 has variable block sizes, key length and number of processing rounds.
RC6 was designed to fix a flaw in RC5.
Source: ANDRESS, Mandy, Exam Cram CISSP, Coriolis, 2001, Chapter 6: Cryptography (page 103).
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