def decryptInCTR(key,fileNameToDecrypt,nonce,fileNameToSavePT):
    ct = b64decode(getDataInBytes(fileNameToDecrypt))
    nonce = b64decode(nonce)
    cipher = AES.new(key, AES.MODE_CTR, nonce=nonce)
    start=timer()
    pt = cipher.decrypt(ct)
    end=timer()
    print("Time Taken to Decrypt is ",(end-start))
    print("Time Taken to Decrypt per byte is ",((end-start)/len(pt)))
    pt=pt.decode("utf-8")
    writeFile(pt,fileNameToSavePT)
    return pt