C839 Introduction To
Cryptography – Algorithms
with verified solutions 2025
The A5/1 cryptosystem uses a 64 bit key size and is used with _____
networks.
GSM Cellular
Chaskey is a light-weight cryptography method used for signing
messages that employs a ____ bit key size.
128
What is the cryptoystem used with 3GPP?
A5/3
3 multiple choice options
WEP employs a ____ bit initialization vector.
24
Between ChaCha, RC5, RC6, and RC4, which are symmetric stream
ciphers?
ChaCha
RC4
The____ cryptosystem is also known as KASUMI
A5/3
____ is a deprecated symmetric block cipher designed by the NSA
that was used with the Clipper chip.
SKIPJACK
Which light-weight symmetric stream cipher from the list has an 80-
bit key size and 80-bit IV?
Trivium
, True or False: CAST5 is a symmetric block cipher with a block size of
64 bits
True
Which light-weight symmetric block cipher has a variable block size
of 32, 48, 64, 96, or 128 bits and is optimized for software
implementations?
SPECK
True or False: 3DES operates with 64-bit blocks, 56 bit keys and 16
rounds
False. DES operates with 64 bit blocks, 56 bit keys and 16 rounds.
3DES operates with 64 bit blocks, 112 bit keys an 48 rounds.
Which light-weight cryptography method for signing messages has a
relatively undemanding hardware implementation (only ~3,333
gates required at 1MHz clock rate) making it suitable for IoT
implementation?
Chaskey
Which light-weight symmetric block cipher has a variable block size
of 32, 48, 64, 96, or 128 bits and is optimized for hardware
implementations?
SIMON
Which light-weight public key cipher is best paired with RFID
implementations?
Elli
Quark is a light-weight cryptography method used for hashing and
stream encryption. What size message digest is Quark capable of
producing when used for hashing?
64
112
RC4 employs a key size of ____ bits when used in WEP
implementations
40
___ operates with 128-bit blocks and a variable key size of 128, 192,
or 256 bits.
Cryptography – Algorithms
with verified solutions 2025
The A5/1 cryptosystem uses a 64 bit key size and is used with _____
networks.
GSM Cellular
Chaskey is a light-weight cryptography method used for signing
messages that employs a ____ bit key size.
128
What is the cryptoystem used with 3GPP?
A5/3
3 multiple choice options
WEP employs a ____ bit initialization vector.
24
Between ChaCha, RC5, RC6, and RC4, which are symmetric stream
ciphers?
ChaCha
RC4
The____ cryptosystem is also known as KASUMI
A5/3
____ is a deprecated symmetric block cipher designed by the NSA
that was used with the Clipper chip.
SKIPJACK
Which light-weight symmetric stream cipher from the list has an 80-
bit key size and 80-bit IV?
Trivium
, True or False: CAST5 is a symmetric block cipher with a block size of
64 bits
True
Which light-weight symmetric block cipher has a variable block size
of 32, 48, 64, 96, or 128 bits and is optimized for software
implementations?
SPECK
True or False: 3DES operates with 64-bit blocks, 56 bit keys and 16
rounds
False. DES operates with 64 bit blocks, 56 bit keys and 16 rounds.
3DES operates with 64 bit blocks, 112 bit keys an 48 rounds.
Which light-weight cryptography method for signing messages has a
relatively undemanding hardware implementation (only ~3,333
gates required at 1MHz clock rate) making it suitable for IoT
implementation?
Chaskey
Which light-weight symmetric block cipher has a variable block size
of 32, 48, 64, 96, or 128 bits and is optimized for hardware
implementations?
SIMON
Which light-weight public key cipher is best paired with RFID
implementations?
Elli
Quark is a light-weight cryptography method used for hashing and
stream encryption. What size message digest is Quark capable of
producing when used for hashing?
64
112
RC4 employs a key size of ____ bits when used in WEP
implementations
40
___ operates with 128-bit blocks and a variable key size of 128, 192,
or 256 bits.
