# Module __builtin.Nettle.BlockCipher()->CTR

Inheritance graph

Description

  Implementation of Counter Mode (CTR). Works as a wrapper for the cipher algorithm in the parent module.

  This cipher mode works like a stream cipher with a block size >= 1. This means that the same key and initialization vector (aka counter) should never be reused, since a simple xor would reveal information about the plain text. It also means that it should never be used without a suiteable Message Authentication Code (MAC).

See also

  CBC, CCM, GCM, MAC

Inherit Cipher

  inherit .Cipher : Cipher