Stream Cipher Here we are going to write simple tools for frequency analysis to break the substitution cipher. The following ciphertext was encrypted using a simple substitution cipher. As we learned in class, these stream ciphers preserve the language characteristics of plaintext and hence are vulnerable to frequency analysis attack.

gsrhrhgsvkozrmgvcggszgdzhvmxibkgvwfhrmtgsvhfyhgrgfgrlmzmwxlmti zgfozgrlmhblfszevhfxxvhhufoobwvxrksvivwgsvnvhhztvzmwryvorvevgs zgblfmldszevyvggvifmwvigzmwrmtlmsldgsvyzhrxhfyhgrgfgrlmxrksvid liphgsvgirzozmwviilikilxvhhdzhylirmtyfglmxvzuvdovggvihuzoormgl gsvkozxvhgsvivnzrmrmtlmvhdroowlhljfrxpobuilnsvivrznvmgvirmtgsv nvzmrmtovhhhvmgvmxvhglnzpvgsvwvxrksvivzhrvi