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WG D334 / C839V5 ADDITIONAL
PRACTICE EXAM 2024/
128 - correct answer✔✔ The hash value in bits for MD5 is ____. A. 128 B. 160 C. 256 variable; fixed - correct answer✔✔ Hashing involves taking a _____ length input and producing a _____ length output (message digest). A. fixed; fixed B. variable; fixed C. fixed; variable 160 - correct answer✔✔ The hash value in bits for SHA-1 is ____. A. 128 B. 160 C. 256 128 - correct answer✔✔ The hash value in bits for MD4 is ____. A. 128 B. 160 C. 256 Transport - correct answer✔✔ IPSec ______ mode involves "end-to-end" encryption; i.e. data remains encrypted from the time it leaves a sender's device to the time it arrives at the receiver's device. A. Tunnel B. Transport
C. Trusted Tunnel - correct answer✔✔ IPSec ______ mode involves encryption from gateway to gateway, i.e. just through the public network space. A. Tunnel B. Transport C. Trusted Tunnel Remember, with tunnel mode, encryption does not happen until just before it leaves the local network. Traffic likely remains unencrypted between the end user device and the local network boundary. - correct answer✔✔ A security analyst on a local network using monitoring tools is likely to only be able to read contents of traffic encrypted using IPSec ______ mode. A. Tunnel B. Transport C. Trusted Chaskey - correct answer✔✔ _____ is a lightweight cryptography method for signing messages (MAC). It boasts a relatively undemanding hardware implementation (only ~3,333 gates required at 1MHz clock rate) making it suitable for IoT implementation. 128 - correct answer✔✔ Chaskey has a key size of _____ bits. A. 256 B. 128 C. 80 salt - correct answer✔✔ A weakness of one-way hashing is that the same piece of plaintext will result in the same ciphertext unless _____ is applied. A. Salt B. Ash
Triple Data Encryption Standard (3DES) - correct answer✔✔ _____ has a block size of 64 bits, key size of 112 bits, and 48 rounds of substitution & transposition. A. DES B. RSA C. 3DES 128, 192, 256 - correct answer✔✔ Key sizes used with the Advanced Encryption Standard (AES) include _____. _____, or _____. A. 10, 12, 14 B. 128, 192, 256 C. 32, 64, 80 128 - correct answer✔✔ The Advanced Encryption Standard (AES) operates using _____ bit blocks. A. 128 B. 192 C. 256 80 - correct answer✔✔ Skipjack is a symmetric block cipher that uses a ______ bit key. A. 64 B. 80 C. 112 128-bit key size; 64-bit IV - correct answer✔✔ Enocoro operates with a key size of ______ bits and an initialization vector (IV) of _____ bits. A. 80; 80 B. 128; 64 C. 80; 64 64 - correct answer✔✔ Skipjack has a block size of _____bits.
A. 64
B. 80
C. 128
Light-weight hashing algorithms - correct answer✔✔ PHOTON, SPONGENT, Lesamnta-LW, and Quark are examples of light-weight _____. A. hashing algorithms B. public-key algorithms C. symmetric block ciphers IDEA - correct answer✔✔ _____ has a block size of 64 bits, key size of 128 bits, and >17 rounds of substitution & transposition. A. RSA B. DSA C. IDEA RSA - correct answer✔✔ _______ is a partially homomorphic crypto system that leverages prime number characteristics, operates with a 1024-4096 bit variable key size, and 1 round. A. RSA B. Diffie-Hellman C. Chaskey Symmetric Block - correct answer✔✔ Blowfish and Twofish are both _____ ciphers with common key sizes of 128, 192, or 256 bits. A. symmetric block B. symmetric stream C. asymmetric RC5 - correct answer✔✔ _____ is a symmetric block cipher that uses block sizes of 32, 64, or 128 bits and boasts a variable key size up to 2048 bits.
40 - correct answer✔✔ RC2 has a block size of 64 bits and variable key size up to 128 bits. What is the minimum recommended key size to use when employing RC2? A. 1 B. 40 C. 64 80; 80 - correct answer✔✔ The light-weight symmetric steam cipher Mickey v2 operates with a key size of ______ bits and an initialization vector (IV) variable up to _____ bits. A. 80; 80 B. 64; 128 C. 128; 64 Symmetric stream cipher - correct answer✔✔ RC4 is a(n) _____. A. Symmetric block cipher B. Symmetric stream cipher C. Asymmetric algorithm certificate signing request (CSR) - correct answer✔✔ An entity seeking to obtain a digital certificate must generate and submit a _____ request to a certificate authority to request the certificate. A. certificate binding B. certificate signing C. certificate initialization Symmetric stream cipher - correct answer✔✔ ChaCha is a(n) _____. A. Symmetric block cipher B. Symmetric stream cipher C. Asymmetric algorithm Asymmetric algorithms - correct answer✔✔ RSA and DSA are both_____. A. Hash algorithms
B. Symmetric stream ciphers C. Asymmetric algorithms Diffie-Hellman - correct answer✔✔ _____ provides a method for key exchange using a one-way function. A. A hash algorithm B. Quark C. Diffie-Hellman Chaskey - correct answer✔✔ _____ is a Lightweight cryptography method for signing messages (MAC). A. Chaskey B. Diffie-Hellman C. Vigenere 40 - correct answer✔✔ WEP uses _____-bit RC4. A. 40 B. 128 C. 256 asymmetric key pair - correct answer✔✔ An entity seeking to obtain a digital certificate must first generate a _____ for themselves. A. secret key B. asymmetric key pair C. registration authority 128 - correct answer✔✔ WPA uses _____-bit RC4. A. 40 B. 128 C. 256
collision - correct answer✔✔ A _____ occurs when two different input values produce the same hash signature. A. collision B. rainbow C. tunnel UTF-16 - correct answer✔✔ _____ is an encoding method with 16-bit values and supports up to 65, characters. 80; 80 - correct answer✔✔ The light-weight symmetric stream cipher Trivium operates with a key size of ______ bits and an initialization vector (IV) of _____ bits. A. 80; 80 B. 64; 128 C. 128; 64 hardware security module (HSM) - correct answer✔✔ A _____ is a tamper-evident and intrusion- resistant physical device that safeguards and manages cryptographic keys and provides cryptographic processing. A. TPM B. HSM C. DES trusted platform module (TPM) - correct answer✔✔ A _____ is a dedicated processor that handles hardware-level encryption; allows the use of full disk encryption on a hard drive in a manner that minimizes the impact on system performance. A. TPM B. HSM C. PRNG HMAC - correct answer✔✔ _____ is a message authentication code (MAC) that can be used to verify the integrity and authentication of the message. It involves hashing the message with a secret key, and thus differs from standard hashing, which is purely a one-way function.
A. HMAC
B. Rainbow table C. Key escrow Symmetric - correct answer✔✔ _____ ciphers make use of a single secret key for both encryption and decryption. 01011 - correct answer✔✔ Solve by applying the binary XOR function. 1 1 0 1 1 1 0 0 0 0 A. 11011 B. 10000 C. 01011 10000 - correct answer✔✔ Solve by applying the binary AND function. 11011 10000 A. 11011 B. 10000 C. 01011 11011 - correct answer✔✔ Solve by applying the binary OR function. 11011 10000 A. 11011 B. 10000
CFB, OFB, CTR - correct answer✔✔ Which symmetric block cipher modes enable the block cipher to operate like a stream cipher? A. ECB, DES, ECC B. CFB, OFB, CTR C. DSA, RSA, RC S-boxes - correct answer✔✔ Symmetric block ciphers make use of _____ to perform substitution as part the encryption process. A. p-boxes B. s-boxes C. IVs 64 - correct answer✔✔ PRESENT is a light-weight symmetric block cipher with a key size of 80 or 128 bits, 32 rounds, and ______ bit block size. A. 32 B. 64 C. 128 Asymmetric - correct answer✔✔ ______ cryptography makes use of a key pair (one public, one private) to perform encryption and decryption. If a given key in a key pair is used for encryption, only the opposite key in that key pair can perform the reverse decryption. A. Symmetric B. Asymmetric C. Hash Secret key - correct answer✔✔ When encrypting data using symmetric cryptography, which key may need to be exchanged to facilitate decryption? A. Secret key B. Private key C. Public key
2048 - correct answer✔✔ RC5 is a conventional symmetric block cipher that is suitable for light-weight implementations. It has a variable key size with a max of _____bits. A. 128 B. 256 C. 2048 128 bit blocks; 128, 192, or 256 bit keys - correct answer✔✔ What is the block and key size in bits used by the light-weight symmetric block cipher CLEFIA? A. 64 bit blocks; 64 bit keys B. 64 or 80 bit blocks; 128 bit keys C. 128 bit blocks; 128, 192, or 256 bit keys Sue's private key - correct answer✔✔ If Shawn employs public key cryptography to send Sue a digitally signed message, which key will Sue use to decrypt the message? A. Sue's private key B. Shawn's private key C. Sue's public key Cramer-Shoup - correct answer✔✔ _____ is a public key encryption method that is an extension of El Gamal but adds a one-way hashing method which protects against an adaptive chosen ciphertext attack. A. Cramer-Shoup B. Ephemeral C. Key Clustering Homomorphic - correct answer✔✔ With _____ encryption, we can perform mathematical operations on ciphered values i.e., before decryption. A. Polyalphabetic B. Homomorphic C. Quantum
Sue's public key - correct answer✔✔ If Shawn plans to employ public key cryptography to send Sue a digitally signed message, which key will Shawn use to encrypt the message? A. Sue's private key B. Sue's public key C. Shawn's public key DER - correct answer✔✔ Which encoding scheme for x.509 certificates supports binary formats? A. DER B. PEM C. MAC Hashing - correct answer✔✔ _____ describes one-way or irreversible encryption used for protecting the integrity of data and in authentication applications. A. Symmetric encryption B. Hashing C. Key escrow conventional - correct answer✔✔ NIST categorizes servers, desktops, tablets and smart phones as devices within the device spectrum for _____cryptography. A. non-cryptographic B. light-weight C. conventional light-weight - correct answer✔✔ NIST categorizes embedded systems, RFID, and sensor networks as devices within the device spectrum for _____cryptography. A. non-cryptographic B. light-weight C. conventional
HOTP - correct answer✔✔ _____ allows a new unique passcode to be created each instance, based on a counter value and an initial seed. A. One Time Passwords (OTP) B. Hashed One Time Passwords (HOTP) C. Timed One Time Password (TOTP) Quantum - correct answer✔✔ _____ computers have fast multiplication circuits, and thus can be used to perform multiplications and search a range of prime numbers at a speed which would break most existing RSA implementations. A.RFID B. Quantum C. Light-weight SIMON - correct answer✔✔ _____ is a light-weight symmetric block cipher with variable block sizes, key sizes, and rounds, that is optimized for hardware implementations. A. SIMON B. SPECK C. PRESENT SPECK - correct answer✔✔ _____ is a light-weight symmetric block cipher with variable block sizes, key sizes, and rounds, that is optimized for software implementations. A. SIMON B. SPECK C. PRESENT AES - correct answer✔✔ PRESENT is a symmetric block cipher that was one of the first to be considered as a(n) _____ replacement for light-weight implementations. A. AES B. BIFID
3GPP - correct answer✔✔ A5/3 is for _____ , and is based on the MISTY1 cipher. A. key transport B. GSM C. 3GPP GSM - correct answer✔✔ A5/1 is designed to be used for the _____ network. A. key transport B. GSM C. 3GPP ChaCha20 - correct answer✔✔ Google proposed _____ as an alternative to AES to be used with TLS connections. A. ChaCha B. DES C. WPA Elli - correct answer✔✔ _____ is a light-weight public key solution that uses Elliptic Curves along with a Diffie-Hellman related handshake between the RFID tag and the RFID reader in RFID implementations. A. ECC B. AES C. Elli non-cryptographic - correct answer✔✔ Buzhash, Cityhash, Spookyhash, and Bernstein are examples of _______ hash solutions. A. light-weight B. quantum C. non-cryptographic OTP - correct answer✔✔ _____ allow for a new unique passcode to be created for each instance based on an initial seed.
A. One Time Passwords (OTP) B. Hashed One Time Passwords (HOTP) C. Timed One Time Password (TOTP) UDP port 500 - correct answer✔✔ The IPSec handshake takes place on UDP port _____ for key exchange. A. 500 B. 50 C. 51 50 - correct answer✔✔ What is the protocol number for encapsulating security protocol (ESP)? A. 500 B. 50 C. 51 51 - correct answer✔✔ What is the protocol number for IPSec Authentication Header (AH)? A. 500 B. 50 C. 51 symmetric - correct answer✔✔ With SSL/TLS, the tunnel is created with a _____ key method, and then a signature is created with a defined hashing method. A. asymmetric B. symmetric C. transport Virtual Private Network (VPN) - correct answer✔✔ With a _____ tunnel we aim to create a connection from a host machine to a trusted network, and which is tunneled through a public network A. Virtual Private Network (VPN) B. Telnet
