Encryption-decryption algorithm by Hellerick

# Encryption-decryption algorithm by Hellerick, 2012-05-28

from random import randint

minascii=ord(' ')
maxascii=ord('~')
asciirange=maxascii-minascii+1

def shuffle(w,p,enc_dec):
    result = ''
    for i in range(len(w)):
        for j in range(len(p)):
            for k in range(len(p)):
                p[j]=(p[j]+p[j]%(p[k]+1))%asciirange
        char=ord(w[i])
        for j in range(len(p)): char+=p[j]*(j%4*2+1)*enc_dec
        result+=chr((char-minascii)%asciirange+minascii)
    return result

def encrypt(w,password='Rule, Britannia!'):
    p, addcode = [], ''
    for i in range(4):
        p+=[randint(minascii,maxascii)]
        addcode+=chr(p[i])
    for i in range(len(password)): p+=[ord(password[i])]
    return addcode+shuffle(w,p,+1)

def decrypt(w,password='Rule, Britannia!'):
    p = []
    for i in range(4): p+=[ord(w[i])]
    for i in range(len(password)): p+=[ord(password[i])]
    return shuffle(w[4:],p,-1)

text='Lingvoforum~'
enctext=encrypt(text,'Password')
dectext=decrypt(enctext,'Password')
incdectext=decrypt(enctext,'Passwort')
print 'Original text:                  "'+text+'"'
print 'Encrypted:                      "'+enctext+'"'
print 'Decrypted (correct password):   "'+dectext+'"'
print 'Decrypted (incorrect password): "'+incdectext+'"'