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CSC 386 – Computer Security

CSC 386 – Computer Security. Scott Heggen. Agenda. Cryptography. Substitution Cipher (Caesar Cipher). k =. Alice. Bob. “ egc hjj ”. C = E( k,m ) = “ egc hjj ”. D. E. “bad egg”. “bad egg”. k. k. Eve. Ciphers. How can we improve upon the Caesar Cipher?.

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CSC 386 – Computer Security

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  1. CSC 386 – Computer Security Scott Heggen

  2. Agenda • Cryptography

  3. Substitution Cipher (Caesar Cipher) k = Alice Bob “egchjj” C = E(k,m) = “egchjj” D E “bad egg” “bad egg” k k Eve

  4. Ciphers • How can we improve upon the Caesar Cipher?

  5. Other Substitution Ciphers k =

  6. Assignment • For Monday: • Create a Python script which takes in two files:original_message.txtand key.txt • The original_message.txtfile can contain any message you chose to send me • The key.txt file must contain your B-number, without the letter B • The Python script must compute C using the message and the key. Your encryption algorithm E should be a pseudo-random substitution cipher which shifts each letter of message by the integer value in key with the same index (e.g., message[0] should be shifted by key[0] letters) • Submit to Moodle: • Your Python Script • coded_message.txt

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