2.1. The stream cipher described in Definition 2.1.1 can easily be generalized to work in alphabets other than the binary one. F
or manual encryption, an especially useful one is a stream cipher that operates on letters. 1. Develop a scheme which operates with the letters A, B,..., Z, represented by the numbers 0,1,...,25. What does the key (stream) look like? What are the encryption and decryption functions? 2. Decrypt the following cipher text: bsaspp kkuosp which was encrypted using the key: rsidpy dkawoa 3. How was the young man murdered?
1 answer:
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Answer:
The program code is in explaination
Explanation:
Program code below.
def judge(auction,price):
"""
Function: Returns Name who auctioned very near to give price
Input :
auction : list of tuples
price : auction price
output: returns name of best auction amount holder
"""
diff = [] #storing differences between auctionist amount and price
count = 0
for each_pair in auction:
if each_pair[1]<=price:
diff.append(price-each_pair[1])
else:
count+=1
diff.append(each_pair[1])
if count == len(auction): #check for if no one have auctioned good amount
return None
else:
more_possibility_index = diff.index(min(diff)) #finding index of best amount from diff list
return auction[more_possibility_index][0]
auction = [('Alice',430),('Bob',538),('Carol',487),('David',550)]
price = 520
print(judge(auction,price))
I kept the output at the attachment.
