The package backoff 1.11.1-0kali1~jan+nur6 migrated to kali-experimental. The .changes file shown below gives you more information about this new version: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Fri, 20 Aug 2021 14:55:02 -0000 Source: backoff Architecture: source Version: 1.11.1-0kali1~jan+nur6 Distribution: kali-experimental Urgency: low Maintainer: Kali Developers <[email protected]> Changed-By: Kali Janitor <[email protected]> Changes: backoff (1.11.1-0kali1~jan+nur6) kali-experimental; urgency=low . * New upstream release. * Build for debian-janitor apt repository. Checksums-Sha1: 2e3c1fbe755156f9cbbe5680af0d0bebfe8d0a0f 1919 backoff_1.11.1-0kali1~jan+nur6.dsc 2834e4893fb3f937518fcb7c1e06cb1702450c49 17581 backoff_1.11.1.orig.tar.gz 190003718192ae7ee56dc89e7ae50a76e5c0de75 2960 backoff_1.11.1-0kali1~jan+nur6.debian.tar.xz Checksums-Sha256: 5767f01097a725f8ef0040584e813f018db768fd3b80f75419358f887460444e 1919 backoff_1.11.1-0kali1~jan+nur6.dsc 29170f1628bfa61e9d37a84ac274fec48211331e6b0f0df7eb8fa6d624446f70 17581 backoff_1.11.1.orig.tar.gz 46358f592ec9a97e8cafcd5708ad1a6c0be30d3bc79f3cc014fcff582d59a1b9 2960 backoff_1.11.1-0kali1~jan+nur6.debian.tar.xz Files: 2ceb31af8c0853a323b634ffd4662ee3 1919 python optional backoff_1.11.1-0kali1~jan+nur6.dsc a56ff28f9d90ffa9b7f4813f159629e7 17581 python optional backoff_1.11.1.orig.tar.gz 2d3d299f7e35987ac0598609c12b9233 2960 python optional backoff_1.11.1-0kali1~jan+nur6.debian.tar.xz -----BEGIN PGP SIGNATURE----- iQHFBAEBCgAvFiEES09zQYVZp+q1h39IpZnvjcfYkGkFAmEfw9YRHGphbml0b3JA a2FsaS5vcmcACgkQpZnvjcfYkGnFfgwAxhWtuo1rruLOOLoWEiLqCqbHssDcz975 9EhlV3fT2pVFV/qZbER0MHBQFvBu+sp6d5mSbpmtUTTAchxaSV+kCM7L4Lnmkvol dMGQL7mzrb1dJb0KLgifeFK4lCxmiNcrkCXmr4fmMoQQKxL0ozvF0ZJoNfashDTH PshEsfk0V8XaQ8mMsIyPTAqsmdiCYRMNFVyaaRWIU8IJyJioPgkTPMHKjOOEKfqb 4H7SB0hc3mvI/x+EfaQg3jKY0CJi53fk4zwYudQJdlB9jZxYI4qzrueKe6DvMh6m vZhYN8IpDp/1uyDOLwfmZ7T4undeBT74Szzas9ArR+wLd9iI1WUGw5005VvL1AIS Of2L/d1RhPsYRYi6daBApm8f4VNHsOr7g+iQfJnJs1fB7uOS2G9Hqc9rfP9dYY9w VMPc9a/thz4pM+8l34cl3KZYGufXsSz6OSrqrAjhv9QZ+C+h7SP5plmg0EsYM9li vGWcxpJbhYwqggr6iuwjYqcK34TyR0U6 =koQs -----END PGP SIGNATURE----- -- More information about backoff: http://pkg.kali.org/pkg/backoff