Caesar cypher

What is caesar cypher?

import random

def enc(str,seed):

result=""

for x in range(0,len(str)):

ch=str[x]

result=chr(ord(ch)+seed)+result

return result

def dec(str,seed):

result=""

for x in range(0,len(str)):

ch=str[x]

result=chr(ord(ch)-seed)+result

return result

t=input("Enter text ")

seed=random.randint(0,1024)

print("seed is ",seed)

e=enc(t,seed)

print("encrypted string")

print(e)

print("decrypted string")

d=dec(e,seed)

print(d)