Cryptography Homework

• Find good encryption solutions
• Search the web for various commercial encryption algorithms.
• Find one that you feel may be "snake oil".
• Write a report explaining the encryption algorithm and your opinion

*in-text citations and references are required
*written in at least 2~3 paragraphs

Compete encoding and decoding messages

Julius Caesar used a simple substitution cipher to send messages to his troops. He substituted each letter by the letter that was 3 places further along in the alphabet, so that "a" was replaced with "D", "b" with "E" and so on.

• Complete the table below to show what each letter is enciphered as using this system.

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       
D    E        F                                                                                                

Using the Caesar Cipher, encode the name of your school. Did your partner get the same answer?Computer scientist would call 3 the "key" for this cipher. How many different keys are possible?Encode the following messages:

Caesar cipher with a shift key of 21

Plaintext: WELCOMECiphertext:

Simple Transposition Cipher with keyword: cat Write LIONS across the top and then write the plaintext, start with column 2 since I is the first letter, next read column 1, etc. the ciphertext is the resulting rows.

Plaintext: OCEAN CITY
Ciphertext:

Caesar cipher with a shift key of 7
Plaintext: MARYLAND BLUE CRABS
Ciphertext:

Caesar cipher with a shift key of 2
Plaintext: INNER HARBOR IN BALTIMORE CITY
Ciphertext:

Decode the following messages:
Use the Caesar cipher with a shift key of __2___
Ciphertext: EQORWVGTUEKGPEG
Plaintext:
Use the Caesar cipher with a shift key of __2___
Ciphertext: OCTANCPFJCUVJGDGUVETCDECMGU
Plaintext:

Use the Caesar cipher with a shift key of __-3___
Ciphertext: QEBZFMEBOEXPYBBKYOLHBK
Plaintext:

Use Simple Transposition cipher with the keyword: lions Write the second set of data down the first column, since I is the first letter, The second column will be the first five characters, etc.
Ciphertext: HPSSR TIIAB SETTA IHNYE CREOK
Plaintext: