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Cryptography and Linux Command Line: The Unit 4 Review Flashcards | StudBud
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Cryptography and Linux Command Line: The Unit 4 Review
Cryptography and Linux Command Line: The Unit 4 Review
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Questions
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Answers
1
Which command displays command history?
pwd
history
cat
ls
2
Which characters does Base64 use?
A-Z, a-z, 0-9, +, /
ASCII only
0-9 only
1s and 0s
3
Which of the following is a hexadecimal number?
A7
29
1101
G4
4
How many
bytes
does standard ASCII use to represent one character?
1 byte
2 bytes
4 bytes
It varies depending on the character
5
What is plaintext?
Hex code
Encrypted data
Binary code
Data before encryption
6
What does the following command do?
Finds lines that contain "Error" only in lowercase
Deletes lines that contain the word "error"
Counts the number of errors in the file
Ignores case and finds all lines containing "error" or "Error"
7
What will the following command line do?
Search for ".txt" inside the files
List all hidden files that are not .txt
List all files and folders that contain the word "txt"
List only .txt files, including hidden ones
8
What is the purpose of the '>' symbol in the Linux Command Line?
Compress file
Comment
Redirect output
Clear screen
9
What Linux command sorts data randomly?
sort -rand
sort -r
rsort
sort -R
10
Which steganography tool views file structure in hex?
Binwalk
CyberChef
Exif Viewer
Hex Editor
11
ASCII doesn't just encode letters. Which of the following
is also represented
in the ASCII character set?
Symbols like @, #, and punctuation marks
Mathematical formulas
Emojis
Photos and sound files
12
What does metadata reveal?
File info like date and GPS location
Binary codes
Hidden viruses
Photo filters
13
What does the `grep` command do in Linux Command Line?
Encrypts files
Searches Text
Deletes files
Identifies working directory
14
Which of these is a
polyalphabetic
cipher?
Vigenère
Rot13
Scytale
Caesar
15
Which number system uses only 0 and 1?
Hexadecimal
Decimal
Binary
ASCII
16
What characters are used in hexadecimal
after
the digit 9?
G, H, I, J, K, L
0 through 9 only
10, 11, 12, 13, 14, 15
A, B, C, D, E, F
17
Which Base64 string represents the word '
Cybersecurity
'?
F3li==
11010
Cyber123
Q3liZXJzZWN1cml0eQ==
18
What base is the hexadecimal number system?
Base 16
Base 12
Base 4
Base 8
19
What type of cipher changes the letter positions?
Hashing
Transposition
Substitution
Caesar
20
In the Caesar cipher, what does the key determine?
Number of letters to shift
Cipher name
Binary Countr
Password
21
How many bits are in a byte?
8
32
16
4
22
What does the hexadecimal number
1F
equal in decimal?
25
15
31
45
23
Which is NOT a type of encoding?
Base64
Hex
ASCII
SHA256
24
What does this command do?
Sorts the lines in fruit.txt in random order
Prints fruit.txt sorted in reverse alphabetical order
Removes duplicates from fruit.txt
Edits fruit.txt and saves changes
25
Which encryption method is unbreakable if used properly?
Vigenère
One-Time Pad
Monoalphabetic
Base64
26
What does
ls -R
do?
Lists files recursively, including subfolders
Lists only read-only files
Lists files in random order
Lists recently modified files
27
What tool extracts hidden files from another?
Binwalk
Sort
Find
Exif Viewer
