1. Given that the Caesar's cipher was used, find the plaintext that corresponds to the following ciphertext: VSRQJHEREVTXDUHSDQWU. Find the plaintext and the key, given the ciphertext CSYEVIXIV MREXIH. Hint: The key is a shift of the alphabet. 2. Determine the plaintext and key for the following ciphertext MXDXBVTZWVMXNSPBQXLIMSCCSGXSCJXBOVQXCIZMOJZCVC TVWJCZAAXZBCSSCJXBQCJZCOJZCNSPOXBXSBTVWJC JZDXGXXMOZQMSCSCJXBOVQXCJZMOJZCNSPJZHGXXMOSPLH JZDXZAAXZBXHCSCJXTCSGXSCJXBOVQX Hint: The message was encrypted with a simple substitution cipher and the plaintext has no spaces or punctuation. 3. Decrypt the following message that was encrypted using a simple substitution cipher: GBSXUCGSZQGKGSQPKQKGLSKASPCGBGBKGUKGCEUKUZKGGBSQEICACGKGCE UERWKLKUPKQQGCIICUAEUVSHqKGCEUPCGBCGQOEVSHUNSUGKUZCGQSNLSH EHIEEDCUOGEPKHZGBSNKCUGSUKUASERLSKASCUGBSLKACRCACUZSSZEUSBE XHKRGSHWKLKUSQSKCHQTXKZHEUQBKZAENNSUASZFENFCUOCUEKBXGBSWK LKUSQSKNFKQQKZEHGEGBSXUCGSZQGKGSQKUZBCQAEIISKOXSZSICVSHSZGEG BSQSAHSGKHMERQGKGSKREHNKIHSLIMGEKHSASUGKNSHCAKUNSOOKOSPBCI SGBCQHSLIMQGKGSZGBKGCGQSSNSZXQSISQQGEAEUGCUXSGBSSJCqGCUOZCLI ENKGCAUSOEGCKGCEUCGAEUGKCUSZUEGBHSKGEHBCUGERPKHEHKHNSZKG GKAD