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Suppose that Alice uses a stream cipher to encrypt plaintext P , obtaining ciphertext C , and Alice then sends C to Bob. Suppose that
Suppose that Alice uses a stream cipher to encrypt plaintext P obtaining ciphertext C and Alice then sends C to Bob. Suppose that Trudy
happens to know the plaintext P but Trudy does not know the key K
that was used in the stream cipher.
a Show that Trudy can easily determine the keystream that was used
to encrypt P
b Show that Trudy can, in effect, replace P with plaintext of her
choosing, say, P That is show that Trudy can create a ciphertext
message C so that when Bob decrypts C he will obtain P
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