a company is deploying an new video conferencing system to be used by the executive team for
board meetings. The security engineer has been asked to choose the strongest available
asymmetric cipher to be used for encryption of board papers, and chose the strongest available
stream cipher to be configured for video streaming. Which of the following ciphers should be
chosen? (Select two)
A.
RSA
B.
RC4
C.
3DES
D.
HMAC
E.
SJA-256
Well, they are for starts managing the impossible…they are encrypting papers…
Jokes aside, they want two things:
Requirement #1: the strongest available asymmetric cipher to be used for encryption (data at rest) and
Requirement #1: the strongest available stream cipher to be configured for video streaming (data in transit)
Let’ start first with a list of Asymmetric algorithms
• X25519 key exchange
• Elliptic curve cryptography
• RSA
• Diffie-Hellman key exchange
• DSA
• Key Serialization
• Asymmetric Utilities
So “RSA” meets Requirement #1, making “A-RSA” one of the two valid answers we are after.
Now I need to find a stream cipher. Suffice to say for the purposes of this exercise that “RC4 is the most widely used stream cipher in software; others include: A5/1, A5/2, Chameleon, FISH, Helix, ISAAC, MUGI, Panama, Phelix, Pike, SEAL, SOBER, SOBER-128, and WAKE.”
So “RC4A” meets Requirement #2, making “B-RC4” the second of the two valid answers we are after.
0
0