O a. A symmetric cipher block chaining encryption algorithm should be used to create cipher text O b. An asymmetric stream encryption algorithm should be used to create cipher text O c. A symmetric stream encryption algorithm should be used to create cipher text O d. An asymmetric cipher block chaining encryption algorithm should be used to create cipher text

2. Encrypt the word SHIELD using an alphabetic Caesar shift cipher that starts with a shift of 8 (A to I) and shifts one additional space after each character is encrypted. Original A BC|DE F GHI J KLMN 0PQR STUV WXY Z Maps to I J KLMNOPQRS TUVW XYZ ABCDE FGH Write the encrypted message for the word SHIELD:

A) Decrypt the following message with Transposition cipher to be understandable using the follo information:- 1) Key(5,2,4,1,3) 2) Cipher text (5 columns and 6 rows) Jaalln eumtpt elpoee Pscaai Yreifs your answer should reveal the plain text and the possible number of keys B) Show how we can make the transposition cipher further hard to break. Support your answer with completely nlaw stronger cipher text for the given message.

Write the solution in detail:A) Encrypt the following message using poly-alphabetic cipher:Plaintext: “HELLO WORLD”Key:Shift the first letter three positions to its rightShift the second letter five positions to its rightShift the third letter seven-position to its left B) Using the same key, decrypt the following text:Cipher text= “vjv xwb wd”