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    Exponential Cipher


    There is 26-letter English alphabet. There is the plain text: HELLO
    Encode the text with exponential cipher (Ek(x) = 7x3 mod(26)).
    The cipher text is:
    a. not possible to encode , it is against the rules
    b. not possible because there is not enough information
    c. JGJJU
    d. MZDDP
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    One of those is quite obviously the answer, without doing any working out. Look at the pattern of the plaintext, then look at the pattern of the ciphertext.

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