CODEWITHSUNDEEP
pythonencryptioncryptographybytersa
False Promise
False Promise

Reputation: 498

Why the length of the encrypted message is changed after downloading this message from file?Python RSA encryption/decryption

Encryption

def encrypt():
k=0
l=1
length=len(message)/20
if int(length)>=1:
    for i in range(int(length)+1):
        message1=""
        if i<int(length)+1:
            i=k
            message1=""
            for j in range(20*i,20*(i+1)):
                message1+=message[j]
            k=i
            message1=message1.encode()
            print(len(message1))
            crypto = rsa.encrypt(message1, pubkey)
            text1.insert(END,crypto)
            cryptow+=crypto
        else:
            message1=""
            for i in range(len(message)-int(length)*20):
                message1+=message[int(length)*20+i]
            message1=message1.encode()
            crypto = rsa.encrypt(message1, pubkey)
            print(type(crypto))
            text1.insert(END,crypto)
            cryptow+=crypto
print(len(cryptow))
showinfo("Attention!","Message was encrypted")

message=2 3 5 7 11 13 17 19 23 29 31 37 41 43 47 53 59 61 67 71

print(len(cryptow)) in penultimate string=96

then i save the resulting cipher in the file:

def save_encrypt_message():
filename = asksaveasfilename()
save_encrypt_message = open(filename,'wb')
print(len(cryptow))
save_encrypt_message = save_encrypt_message.write(cryptow)
save_encrypt_message.close()

print(len(cryptow)) still equally 96

After, i reran program and load cipher from file:

def open_message_for_decrypt():
filename = askopenfilename()
decrypt_message = open(filename,'rb')
decrypt_message = decrypt_message.readlines()
text1.delete('1.0', END)
text1.insert(END,decrypt_message)
print(len(decrypt_message))

and

print(len(decrypt_message)) =1 So WHY?

Upvotes: 0

Views: 63

Answers (1)

jonrsharpe
jonrsharpe

Reputation: 122032

On the line:

decrypt_message = decrypt_message.readlines()

a list is assigned to decrypt_message, where each item in the list is one line from the file; there's only one line in the file...

Upvotes: 0

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