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level: Encryption

Questions and Answers List

level questions: Encryption

QuestionAnswer
Explain the functionality of a substtution caesar cipherLetters are randomly replaced
What 2 types of encryption methods should you be familiar with?Caesar and Vernam
Define encryptionThe process of scrambling data so that it cannot be understood if intercepted in order to keep it secure during transmission
What is meant by the term plaintextunencrypted information
What is meant by the term ciphertextresult of encryption performed on plaintext
What is meant by the term cipheran algorithm for performing encryption or decryption
Explain the functionality of a shift caesar cipherAll the letters in the albabet are shifted by the same amount
Why are caesar ciphers so easily cracked?Once you discover just one character, a shift cipher can be completely cracked The frequency at which each character occurs can provide a clue as to which letter has been replaced with which, e.g. 'E' is the most common in english langauge
What must you know in order to decrypt ciphertextThe encryption method used and the key
What are the two types of Caesar ciphers you need to be aware of?Shift and substituion
Explain the term 'a one-time pad' for a ciphereach key is only ever be used once
What requirements for the key does a Verman cipher haveRandom One time pad At least as long as the plaintext
How does a Verman cipher work?1. Aligning the characters of the plaintext and the key 2. Converting each character of both the key and the plaintext to binary 3. Applying a logical XOR operation to the bit patterns 4. Converting the result back to a character
How is a Verman cipher considered completely secure?Since the key used with a Vernam cipher is chosen at random, the ciphertext is also random
Explain the functionality of a substtution caesar cipherLetters are randomly replaced