6. (a) A message is encrypted with shift cipher twice: once with the key H, and again with the key I. This, however, is equivalent to a single application of shift cipher. What is the key? (b) A message is encrypted with Vigenere cipher twice: once with the key CAT, and again with the key DOGS. Again, this is equivalent to a single application of Vigenere cipher. What is the key

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6.
(a) A message is encrypted with shift cipher twice: once with the key H, and again with the key I. This, however, is equivalent to a single application of shift cipher. What is the key?
(b) A message is encrypted with Vigenere cipher twice: once with the key CAT, and again with the key DOGS. Again, this is equivalent to a single application of Vigenere cipher. What is the key?

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