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WorksheetsEncryption & Decryption Tools
Total questions: 25
Worksheet time: 27mins
What is steganography?
software that draws graphs
a dinosaur
hiding a secret message in a not secret computer file or message
hiding a secret message in a physical object
90% of the time when a computer gets hacked its because of
software design
security bug
human mistake
Asymmetric encryption uses . . .
2 public keys for encryption & decryption of messages
1 private to encrypt messages and 1 public key to decrypt messages
2 private keys for encryption & decryption of messages
1 public key to encrypt messages and 1 private key to decrypt messages
The plugboard on the Enigma Machine connects. . .
the rotors to the letters
pairs of letters that will be transposed
unused pairs of letters
If the sender and receiver agree on the key, it is known as
128 Bit Key
Asymmetric
256 Bit Key
Symmetric
What is the algorithm of Ceasar's cipher?
Each letter is replaced with a particular symbol
Each letter is replaced with a letter a certain number of steps down the alphabet
Each letter is replaced with a particular number from 0 to 26, and numbers are replaced with letters.
Each letter is replaced with a completely random number
The process of converting plaintext to ciphertext.
cryptography
cyphertext
decryption
encryption
What encryption algorithm uses the same key to both encrypt and decrypt messages.
Symmetric
Asymmetric
Who was the first known user of the Caesar Cipher?
Tiberius Caesar
Julius Caesar
Augustus Caesar
Claudius Caesar
The Enigma machine uses symmetric encryption.
True
False
An encryption algorithm transforms plain text into:
Cipher text
Simple Text
Plain text
Filled text
In Cryptography, original message, before being transformed, is called
Simple Text
Plain Text
Cipher Text
Filled Text
_______ is the science and art of transforming messages to make them secure and immune to attacks.
Cryptoanalysis
Cryptography
neither Cryptography nor Cryptoanalysis
either Cryptography or Cryptoanalysis
The process of converting a ciphertext into plaintext.
encryption
decryption
plaintext
cryptography
Consider the process of encoding and decoding a message using the following Caesar cipher encoding scheme in which the plaintext and ciphertext alphabets are offset by four positions, as shown below:
Plaintext: a b c d e f g h i j k l m n o p q r s t u v w x y z
Ciphertext: w x y z a b c d e f g h i j k l m n o p q r s t u v
Which of the following encoded ciphertext strings decodes to an original plaintext message of "secret"?
etsecr
wigvix
kwujwl
oaynap
A Caesar cipher is an example of a ______________________.
transposition cipher
bimodal cipher
substitution cipher
substantial cipher
Caeser achieved his cipher by shifting all the letters _____ spaces to the right.
3
1
7
13
What term is used to describe concealing data in another file such as a graphic, audio, or other text file?
masking
obfuscation
hiding
steganography
Codes have been used for thousands of years to:
figure out where the enemy is
send messages
communicate with some people but not
send secret messages back and forth
Which of these is used regularly for secure online communication?
Caesar cipher
Morse code
Public key cryptography
Enigma code
How can you tell if a website encrypts its traffic?
Google it
Look for the lock symbol in the URL
All websites encrypt their traffic
Encrypted sites take longer to load
Consider the process of encoding and decoding a message using the following Caesar cipher encoding scheme in which the plaintext and ciphertext alphabets are offset by four positions, as shown below:
Ciphertext: w x y z a b c d e f g h i j k l m n o p q r s t u v
Plaintext: a b c d e f g h i j k l m n o p q r s t u v w x y z
Which of the following encoded ciphertext strings decodes to an original plaintext message of "secretd
Decode the following: yuxan
crypt
color
cyber
cystic
Steganography is used only with text.
True
False
Scrambling or changing a message to hide it is called
Secure Communication
Symmetric Encryption
Encryption
Public Keys
