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+# checkpw - Check passwords agains pwnedpaswords.com
+
+A simple tool to check passwords against the database at [pwnedpasswords.com] using the [k-anonymity] protocol.
+
+The password entered is hashed, and only a small part of hash (five digits) is sent to the server. This ensures that neither the server, nor any man-in-the-middle can know the exact password you submit.
+
+## Building the code
+
+You need to have Rust and Cargo installed on your system. Then simply run:
+
+ % cargo build --release
+
+To build the release build. You'll find the resulting binary in `target/release/checkpw`.
+
+## Contributing
+
+Issues and merge requests are welcome!
+
+## License
+
+Copyright (C) 2018 Harald Eilertsen <haraldei@anduin.net>
+
+This program is free software: you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation, either version 3 of the License, or
+(at your option) any later version.
+
+This program is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with this program. If not, see <https://www.gnu.org/licenses/>.
+
+[pwnedpasswords.com]: https://pwnedpasswords.com
+[k-anonymity]: https://www.troyhunt.com/ive-just-launched-pwned-passwords-version-2/#cloudflareprivacyandkanonymity