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+# RustCrypto: Counter Mode (CTR)
+
+[![Crate][crate-image]][crate-link]
+[![Docs][docs-image]][docs-link]
+![Apache2/MIT licensed][license-image]
+![Rust Version][rustc-image]
+[![Project Chat][chat-image]][chat-link]
+[![Build Status][build-image]][build-link]
+[![HAZMAT][hazmat-image]][hazmat-link]
+
+Generic implementations of the [Counter Mode (CTR)][1] of operation for
+block ciphers, which enables adapting block ciphers into stream ciphers.
+
+[Documentation][docs-link]
+
+<img alt="diagram" src="https://raw.githubusercontent.com/RustCrypto/meta/master/img/stream-ciphers/ctr.png" width="500px">
+
+## ⚠️ Security Warning: [Hazmat!][hazmat-link]
+
+This crate does not ensure ciphertexts are authentic (i.e. by using a MAC to
+verify ciphertext integrity), which can lead to serious vulnerabilities
+if used incorrectly!
+
+No security audits of this crate have ever been performed, and it has not been
+thoroughly assessed to ensure its operation is constant-time on common CPU
+architectures.
+
+**USE AT YOUR OWN RISK!**
+
+## Minimum Supported Rust Version
+
+Rust **1.41** or higher.
+
+Minimum supported Rust version can be changed in the future, but it will be
+done with a minor version bump.
+
+## SemVer Policy
+
+- All on-by-default features of this library are covered by SemVer
+- MSRV is considered exempt from SemVer as noted above
+
+## License
+
+Licensed under either of:
+
+ * [Apache License, Version 2.0](http://www.apache.org/licenses/LICENSE-2.0)
+ * [MIT license](http://opensource.org/licenses/MIT)
+
+at your option.
+
+### Contribution
+
+Unless you explicitly state otherwise, any contribution intentionally submitted
+for inclusion in the work by you, as defined in the Apache-2.0 license, shall be
+dual licensed as above, without any additional terms or conditions.
+
+[//]: # (badges)
+
+[crate-image]: https://img.shields.io/crates/v/ctr.svg
+[crate-link]: https://crates.io/crates/ctr
+[docs-image]: https://docs.rs/ctr/badge.svg
+[docs-link]: https://docs.rs/ctr/
+[license-image]: https://img.shields.io/badge/license-Apache2.0/MIT-blue.svg
+[rustc-image]: https://img.shields.io/badge/rustc-1.41+-blue.svg
+[chat-image]: https://img.shields.io/badge/zulip-join_chat-blue.svg
+[chat-link]: https://rustcrypto.zulipchat.com/#narrow/stream/260049-stream-ciphers
+[build-image]: https://github.com/RustCrypto/stream-ciphers/workflows/ctr/badge.svg?branch=master&event=push
+[build-link]: https://github.com/RustCrypto/stream-ciphers/actions?query=workflow%3Actr
+[hazmat-image]: https://img.shields.io/badge/crypto-hazmat%E2%9A%A0-red.svg
+[hazmat-link]: https://github.com/RustCrypto/meta/blob/master/HAZMAT.md
+
+[//]: # (footnotes)
+
+[1]: https://en.wikipedia.org/wiki/Block_cipher_mode_of_operation#CTR