Online Security
What is the purpose of the public key?
Turns the customer's data (plain text) into encrypted data (cipher text)
What does the key mean in a Caesar Cipher?
How many spaces the alphabet has shifted.
How are Substitution Ciphers different from Caesar Ciphers?
Substitution Ciphers use a keyword as the beginning of the cipher alphabet, with the rest of the alphabet following either forwards or backwards. For example:
ABCDEFGHIJKLMNOPQRSTUVWXYZ
ZEBRACDFGHIJKLMNOPQSTUVWXY
What is the purpose of the Private Key
Turns the encrypted data (cipher text) into plain text.
What does a shift of K mean in a Caesar Cipher?
The Caesar Cipher starts with A becoming K
What would be the first letter in the cipher alphabet after the keyword "Alphabet"?
C
Name both ways a customer can tell they are on a secure website
HTTPS in the address, and a padlock symbol in the corner.
Using a shift of 2 to the right, decrypt this code:
Fq pqv hqtigv rgpeknu pgzv yggm
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Why are substitution Ciphers harder to crack than Caesar Ciphers?
The alphabet is not always in order, so unlike Caesar Ciphers, if you know one letter, you won't always know the rest.
What is the name of the set of protocols that allows the customer's browser to talk to the shop?
Secure Socket Layer (SSL)
Using a shift of K, decrypt this message:
Wb Qkexd myevn lokd Tkcyx kd Dklvo Doxxsc
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What is Frequency Analysis? What is the most common and least common letters in the english Alphabet?
Frequency analysis is the study of the distribution of the letters in a text.
Most Common letter: E
Least Common Letter: Z
We should be worried in general, but our data is so secure when shopping online that we shouldn't be worried about our data being stolen.
Using Frequency Analysis, Decode this message:
P dpzo dl jvbsk kv aopz lclyf slzzvu
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With the keyword Zebra, and the alphabet carrying on forwards, decode this text:
Sfa qtl pgqaq gl sfa azqs
The sun rises in the east