P |a |g |e | | |
1
D334 - Introduction To Cryptography Exam With 100%
Verified Questions And Correct Answers
Dictionary-type attack - correct-answer-a brute force analysis
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∉ - correct-answer-does not belong to
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when an object is not in a set
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∈ - correct-answer-Belongs to
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when an object is within a set
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⊆ - correct-answer-subset
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subset has fewer elements or equal to the set
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, P |a |g |e | | |
2
A ∪ B - correct-answer-union (objects that belong to set A or set B)
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| - correct-answer-such that
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A ∩ B - correct-answer-Intersection: in both A and B
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Enigma Machine -Cypher 10 - correct-answer-Used a polyalphabetic substitution
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cipher, which did not repeat within a reasonable time period, along with a secret
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key. For the cracking of the Enigma cipher, the challenge was thus to determine
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both the algorithm used and the key. Enigma's main weakness, though, was
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that none of the plain text letters could be ciphered as itself.
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Four-square cipher9 - correct-answer-Uses four 5 × 5 matrices arranged in a
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square, are where each matrix contains 25 letters for encoding and decoding
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operations.
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One-time pad cypher8 - correct-answer-Cypher Code mapping that is only used
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once.
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, P |a |g |e | | |
3
Advantage: it is essentially unbreakable.
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Disadvantage: it takes lots of work as you would have to generate the pad to be
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used, each time.
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Vigenere Cipher 7 - correct-answer-Polyalphabetic cipher that involves using a
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different mapping, based on a keyword, for each character of the cipher. An
| | | | | | | | | | | | |
advantage of this type of cipher is that the same plaintext character is likely to be
| | | | | | | | | | | | | | | |
coded to different mappings, depending on the position of the keyword, making
| | | | | | | | | | | |
guessing more difficult.
| | |
Ceasar Cipher6 - correct-answer-Mono-alphabetic substitution cipher known as
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"shift" cipher. Involves plaintext being replaced by a letter some fixed number of
| | | | | | | | | | | | |
positions down the alphabet. i.e., a Caesar Cipher using a shift of +3 would mean
| | | | | | | | | | | | | | |
a plaintext letter A would result in a ciphertext letter D (a shift of three positions
| | | | | | | | | | | | | | | |
to the right in the alphabet)
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Morse Code cipher 5 - correct-answer-Encoding method, rather than a cipher,
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that works by translating characters into sequences of dots (.) and dashes (-)
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Playfair Cipher 4 - correct-answer-5 × 5 matrix containing the alphabet less the
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letter J. Cipher/decipher process consists of a set of rules outlining use of
| | | | | | | | | | | | |
column and row combinations.
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, P |a |g |e | | |
4
BIFID Cipher 3 - correct-answer-Makes use of a grid and which maps the letters
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into numeric values.
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Rail Code Cipher 2 - correct-answer-Employs a method to scramble text by writing
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it in a sequence across a number of rails.
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Pig Pen Cipher 1 - correct-answer-Mono- alphabetic substitution cipher that
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makes use of mapping plaintext characters to graphical characters rather than to
| | | | | | | | | | | |
alphabetic ones. i.e. A=(pick a symbol), vs A=(pick a letter). Disadvantage: once
| | | | | | | | | | | |
the mapping is known, it is difficult to keep the message secret.
| | | | | | | | | | | |
Encryption - correct-answer-in simplest terms is changing plaintext into ciphertext
| | | | | | | | |
Decryption - correct-answer-The process of converting a ciphertext into plaintext.
| | | | | | | | |
AESCrypt - correct-answer-Encrypt individual files and encrypt full disks with
| | | | | | | | |
options such as Bitlocker and FileVault
| | | | | |
1
D334 - Introduction To Cryptography Exam With 100%
Verified Questions And Correct Answers
Dictionary-type attack - correct-answer-a brute force analysis
| | | | | |
∉ - correct-answer-does not belong to
| | | | |
when an object is not in a set
| | | | | | | |
∈ - correct-answer-Belongs to
| | |
when an object is within a set
| | | | | | |
⊆ - correct-answer-subset
| |
subset has fewer elements or equal to the set
| | | | | | | |
, P |a |g |e | | |
2
A ∪ B - correct-answer-union (objects that belong to set A or set B)
| | | | | | | | | | | | |
| - correct-answer-such that
| | |
A ∩ B - correct-answer-Intersection: in both A and B
| | | | | | | | |
Enigma Machine -Cypher 10 - correct-answer-Used a polyalphabetic substitution
| | | | | | | |
cipher, which did not repeat within a reasonable time period, along with a secret
| | | | | | | | | | | | | |
key. For the cracking of the Enigma cipher, the challenge was thus to determine
| | | | | | | | | | | | | |
both the algorithm used and the key. Enigma's main weakness, though, was
| | | | | | | | | | | |
that none of the plain text letters could be ciphered as itself.
| | | | | | | | | | | |
Four-square cipher9 - correct-answer-Uses four 5 × 5 matrices arranged in a
| | | | | | | | | | |
square, are where each matrix contains 25 letters for encoding and decoding
| | | | | | | | | | | |
operations.
|
One-time pad cypher8 - correct-answer-Cypher Code mapping that is only used
| | | | | | | | | |
once.
|
, P |a |g |e | | |
3
Advantage: it is essentially unbreakable.
| | | |
Disadvantage: it takes lots of work as you would have to generate the pad to be
| | | | | | | | | | | | | | |
used, each time.
| | |
Vigenere Cipher 7 - correct-answer-Polyalphabetic cipher that involves using a
| | | | | | | | |
different mapping, based on a keyword, for each character of the cipher. An
| | | | | | | | | | | | |
advantage of this type of cipher is that the same plaintext character is likely to be
| | | | | | | | | | | | | | | |
coded to different mappings, depending on the position of the keyword, making
| | | | | | | | | | | |
guessing more difficult.
| | |
Ceasar Cipher6 - correct-answer-Mono-alphabetic substitution cipher known as
| | | | | | |
"shift" cipher. Involves plaintext being replaced by a letter some fixed number of
| | | | | | | | | | | | |
positions down the alphabet. i.e., a Caesar Cipher using a shift of +3 would mean
| | | | | | | | | | | | | | |
a plaintext letter A would result in a ciphertext letter D (a shift of three positions
| | | | | | | | | | | | | | | |
to the right in the alphabet)
| | | | | |
Morse Code cipher 5 - correct-answer-Encoding method, rather than a cipher,
| | | | | | | | | |
that works by translating characters into sequences of dots (.) and dashes (-)
| | | | | | | | | | | | |
Playfair Cipher 4 - correct-answer-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.
| | | |
, P |a |g |e | | |
4
BIFID Cipher 3 - correct-answer-Makes use of a grid and which maps the letters
| | | | | | | | | | | | |
into numeric values.
| | |
Rail Code Cipher 2 - correct-answer-Employs a method to scramble text by writing
| | | | | | | | | | | |
it in a sequence across a number of rails.
| | | | | | | | |
Pig Pen Cipher 1 - correct-answer-Mono- alphabetic substitution cipher that
| | | | | | | | |
makes use of mapping plaintext characters to graphical characters rather than to
| | | | | | | | | | | |
alphabetic ones. i.e. A=(pick a symbol), vs A=(pick a letter). Disadvantage: once
| | | | | | | | | | | |
the mapping is known, it is difficult to keep the message secret.
| | | | | | | | | | | |
Encryption - correct-answer-in simplest terms is changing plaintext into ciphertext
| | | | | | | | |
Decryption - correct-answer-The process of converting a ciphertext into plaintext.
| | | | | | | | |
AESCrypt - correct-answer-Encrypt individual files and encrypt full disks with
| | | | | | | | |
options such as Bitlocker and FileVault
| | | | | |
