Introduction to Cryptography - D334 EXAM QUESTIONS WITH 100% CORRECT
ANSWERS/A+ GRADE
___ is an early cipher that makes use of a grid and which maps the letters into
numeric values. - ✔✔Bifid
____ describes an instance where an attacker takes a legitimate message and
sends it into the network at some future time. - ✔✔The replay system
____ has proven to be free from major vulnerabilities, but poor implementation
of the encryption method leaves it susceptible to attacks such as: Brute force,
use of Non-Random Numbers, copy-and-paste and timing attacks. - ✔✔AES
_____ allow for a new unique passcode to be created for each instance based on
an initial seed. - ✔✔One Time Passwords (OTP)
_____ allows a new unique passcode to be created each instance, based on a
counter value and an initial seed. - ✔✔Hashed One Time Passwords (HOTP)
_____ allows for a new unique passcode to be created for each instance, based
on an initial seed and for a given time period. - ✔✔Timed One Time Password
(TOTP)
_____ are programs stored on a blockchain that run when predetermined
conditions are met; they typically are used to automate the execution of an
agreement so that all participants can be immediately certain of the outcome,
without an intermediary's involvement or time loss. - ✔✔Smart contracts
,_____ are used to manage how blocks of data are processed in symmetric
encryption. - ✔✔Block cipher modes
_____ ciphers make use of a single secret key for both encryption and
decryption. - ✔✔Symmetric
_____ 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. - ✔✔Quantum
_____ cryptography is better suited for real-time communications
implementations than ______ cryptography due to its relative faster speed. -
✔✔Symmetric, Asymmetric
_____ describes a ledger of transactions that allows the Bitcoin network to
know the number of bitcoins that a given user has in their account. -
✔✔Blockchain
_____ describes one-way or irreversible encryption used for protecting the
integrity of data and in authentication applications. - ✔✔Hashing
_____ encoding involves 8-bit values and supports up to 256 characters. -
✔✔ASCII
_____ has a block size of 64 bits, key size of 128 bits, and >17 rounds of
substitution & transposition. - ✔✔IDEA
,_____ involves using subscriber computers to route data packets over the
internet, instead of using publicly available routers. - ✔✔Onion routing
_____ 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. - ✔✔Elli
_____ is a light-weight symmetric block cipher with variable block sizes, key
sizes, and rounds, that is optimized forhardware implementations. - ✔✔SIMON
_____ is a light-weight symmetric block cipher with variable block sizes, key
sizes, and rounds, that is optimized forsoftware implementations. - ✔✔SPECK
_____ is a Lightweight cryptography method for signing messages (MAC). -
✔✔Chaskey
_____ 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. - ✔✔HMAC
_____ is a method that involves generating a encryption key from a piece of the
identity of the recipient. - ✔✔Identity-based Encryption (IBE)
_____ is a mono-alphabetic substitution cipher known as "shift" cipher that
involves plaintext being replaced by a letter some fixed number of positions
down the alphabet. - ✔✔Caesar
, _____ 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. - ✔✔Cramer-Shoup
_____ is a public key method that is used in both encryption and digital signing.
It is used in many applications and uses discrete logarithms. - ✔✔El Gamal
_____ 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. - ✔✔RC5
_____ is an early cipher that uses a 5 × 5 matrix containing the alphabet less the
letter J. Cipher/decipher process consists of a set of rules outlining use of
column and row combinations. - ✔✔Playfair
_____ is an early cipher that uses four 5 × 5 matrices arranged in a square, are
where each matrix contains 25 letters for encoding and decoding operations. -
✔✔Four-square cipher
_____ is an encoding method with 16-bit values and supports up to 65,536
characters. - ✔✔UTF-16
_____ is considered to be unbreakable since it only uses its cipher code once. -
✔✔One-time pad
_____ provides a cryptography method to give a verifiable method that a data
entity was created at a defined time. - ✔✔TSP (Time-Stamp Protocol)
ANSWERS/A+ GRADE
___ is an early cipher that makes use of a grid and which maps the letters into
numeric values. - ✔✔Bifid
____ describes an instance where an attacker takes a legitimate message and
sends it into the network at some future time. - ✔✔The replay system
____ has proven to be free from major vulnerabilities, but poor implementation
of the encryption method leaves it susceptible to attacks such as: Brute force,
use of Non-Random Numbers, copy-and-paste and timing attacks. - ✔✔AES
_____ allow for a new unique passcode to be created for each instance based on
an initial seed. - ✔✔One Time Passwords (OTP)
_____ allows a new unique passcode to be created each instance, based on a
counter value and an initial seed. - ✔✔Hashed One Time Passwords (HOTP)
_____ allows for a new unique passcode to be created for each instance, based
on an initial seed and for a given time period. - ✔✔Timed One Time Password
(TOTP)
_____ are programs stored on a blockchain that run when predetermined
conditions are met; they typically are used to automate the execution of an
agreement so that all participants can be immediately certain of the outcome,
without an intermediary's involvement or time loss. - ✔✔Smart contracts
,_____ are used to manage how blocks of data are processed in symmetric
encryption. - ✔✔Block cipher modes
_____ ciphers make use of a single secret key for both encryption and
decryption. - ✔✔Symmetric
_____ 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. - ✔✔Quantum
_____ cryptography is better suited for real-time communications
implementations than ______ cryptography due to its relative faster speed. -
✔✔Symmetric, Asymmetric
_____ describes a ledger of transactions that allows the Bitcoin network to
know the number of bitcoins that a given user has in their account. -
✔✔Blockchain
_____ describes one-way or irreversible encryption used for protecting the
integrity of data and in authentication applications. - ✔✔Hashing
_____ encoding involves 8-bit values and supports up to 256 characters. -
✔✔ASCII
_____ has a block size of 64 bits, key size of 128 bits, and >17 rounds of
substitution & transposition. - ✔✔IDEA
,_____ involves using subscriber computers to route data packets over the
internet, instead of using publicly available routers. - ✔✔Onion routing
_____ 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. - ✔✔Elli
_____ is a light-weight symmetric block cipher with variable block sizes, key
sizes, and rounds, that is optimized forhardware implementations. - ✔✔SIMON
_____ is a light-weight symmetric block cipher with variable block sizes, key
sizes, and rounds, that is optimized forsoftware implementations. - ✔✔SPECK
_____ is a Lightweight cryptography method for signing messages (MAC). -
✔✔Chaskey
_____ 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. - ✔✔HMAC
_____ is a method that involves generating a encryption key from a piece of the
identity of the recipient. - ✔✔Identity-based Encryption (IBE)
_____ is a mono-alphabetic substitution cipher known as "shift" cipher that
involves plaintext being replaced by a letter some fixed number of positions
down the alphabet. - ✔✔Caesar
, _____ 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. - ✔✔Cramer-Shoup
_____ is a public key method that is used in both encryption and digital signing.
It is used in many applications and uses discrete logarithms. - ✔✔El Gamal
_____ 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. - ✔✔RC5
_____ is an early cipher that uses a 5 × 5 matrix containing the alphabet less the
letter J. Cipher/decipher process consists of a set of rules outlining use of
column and row combinations. - ✔✔Playfair
_____ is an early cipher that uses four 5 × 5 matrices arranged in a square, are
where each matrix contains 25 letters for encoding and decoding operations. -
✔✔Four-square cipher
_____ is an encoding method with 16-bit values and supports up to 65,536
characters. - ✔✔UTF-16
_____ is considered to be unbreakable since it only uses its cipher code once. -
✔✔One-time pad
_____ provides a cryptography method to give a verifiable method that a data
entity was created at a defined time. - ✔✔TSP (Time-Stamp Protocol)
