Write a program that can encrypt and decrypt using the general Caesar cipher, also known as an additive cipher.
NOTE: 1 input is continuous text of maximum 80 characters without blank space
2.there must a function to code each plain text character into its corresponding index
3. a function to perform encryption should ask for shift size
4. a function to decrypt the generated cypher text
Alice meets Bob and says Rjjy rj ts ymj xfggfym.bj bnqq inxhzxx ymj uqfs. If she is using Caesar Cipher, what does she want to convey?
If the security strength of K is 256 bits and SHA-256 is used, the security strength of the HMAC algorithm is___ bits.