Please answer all parts of question

Problem 6 Decrypt the following ciphertext which was encrypted with a shift cipher. Give the encryption key and the decryption key: Liul zj re Zeuf-Ripre crexlrxv jgfbve tyzvwcp ze Jflky Rjzr. Zk zj kyv erkzferc crexlrxv reu czexlr wiretr fw Grbzjkre, nyviv zk zj rcjf re fwwztzrc crexlrxv rcfexjzuv Vexczjy. Ze Zeuzr, Liul zj re Vzxyky Jtyvulcv crexlrxv nyfjv jkrklj reu tlcklirc yvizkrxv zj ivtfxezqvu sp kyv Tfejkzklkzfe fw Zeuzr; zk rcjf yrj re fwwztzrc jkrklj ze jvmvirc Zeuzre jkrkvj. Ze Evgrc, Liul zj r ivxzjkvivu ivxzferc uzrcvtk. Problem 7 Decrypt the following ciphertext which was first encoded with a Base64 encoding and then encrypted with a shift cipher. Give the encryption key and the decryption key (the line breaks are for your convenience only): S3L5eJTXB3LjeIj5KInbKIGidYX0cI9mKI9oKJDad3TnA3TrdoeicY5od3LvAZTrd 24iAY5mKIPxdY11don1AZTrd25bKJTqeo91B2iifI jnKJXbBUDxBkD1d2Tneayie28if IjjfEDxdoz5KJTqd3PnKIBxekD3cI9vKJTqBUDrdoBxeo1 j InxdkDreaDrdpTndoTnB ED1AY4ieoXjBEDjdoSieJLXA2XbeaDrfEA= Problem 8 Decrypt the following ciphertext (encypted by a shift cipher) by brute force: yrkkvexobkx. What do you notice? The following ciphertext is meant to communicate either YES or NO to a trusted field agent: SYM UV. Attempt to decrypt the message using brute force. What is the problem? Problem 10 Returning to Problem 7. Was the encryption more secure when we combined it with an encoding