Can someone answer just the question number 7? Please

Copyright by Shengli Yuan. rights reserved. Show the detail mathematics of decrypting .' and R", into L. and R., (5 points) 6. (10 points) A-stream cipher is used to encrypt. The plain text m, is 10101010, the pseudo random number k is: 01101011. What is the cipl ? Show the detail mathematics (5 points) If another plain text m (for example, 11100010) is encrypted with the same pseudo random number k and generate cipher text cz, what useful information about m and m2 can you extract from ci and c? Show the detail mathematics (5 points) 10.0 7. (10 points) Party B receives a financial transaction request m from someone claims to be party A. The request is encrypted with a shared security key k which only A and B know. Assume the encryption is unbreakable and the key is never leaked. Can B be sure that the request is generated by A? Why? (5 points)