'''
Exingulis Cryptography Department, a subset of the Exingulis Computing Department

Name:   Protocol 5 Prototype Function
PN:     NXLE055CD
CodeID: CD06114
BLoc:   "\Atrisk\ComD\CryptD\ExpEncProgram\Protocol 5\func.py"
'''

import hashlib

def pr5(plaintext):
        defaultKey = "DBx2Ip6nYyr6khhlIv95tzZhUkqEDftY"
        keylist = ""

        for i in plaintext.lower():
            key = hashlib.sha1()
            key.update(defaultKey + i + keylist)
            keylist = keylist + key.hexdigest()[:5] + "."

        return keylist