# SpeckEx v0.2.0 - Table of Contents > Speck block cipher for Elixir, backed by Rust. ## Pages - [SpeckEx](readme.md) - [LICENSE](license.md) ## Modules - [SpeckEx](SpeckEx.md): A high-performance Elixir library for the Speck block cipher, powered by Rust NIFs. Provides Speck in three modes: high-level CTR mode encryption, authenticated encryption in the form of Speck-Poly1305 and the primitive block cipher. - [SpeckEx.AEAD](SpeckEx.AEAD.md): Authenticated Encryption with Associated Data (AEAD) using Speck-Poly1305. - [SpeckEx.Block](SpeckEx.Block.md): Low-level block cipher primitives for the Speck cipher. - [SpeckEx.CTR](SpeckEx.CTR.md): Counter (CTR) mode encryption using the Speck block cipher.