The package backoff 1.10.0-0kali1 migrated to kali-rolling. The .changes file shown below gives you more information about this new version: -----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 Format: 1.8 Date: Wed, 16 Dec 2020 14:41:30 +0100 Source: backoff Architecture: source Version: 1.10.0-0kali1 Distribution: kali-dev Urgency: medium Maintainer: Kali Developers <[email protected]> Changed-By: Sophie Brun <[email protected]> Changes: backoff (1.10.0-0kali1) kali-dev; urgency=medium . * Initial release Checksums-Sha1: 1e51209a1651ff9543b5abd909b005eaff674471 2064 backoff_1.10.0-0kali1.dsc a116477ad08c49225767a481567aa34c4f3babe6 15546 backoff_1.10.0.orig.tar.gz 3c7da52092ffafbd5e64c397d78ba793676fd063 2820 backoff_1.10.0-0kali1.debian.tar.xz 1a455f4b0d5f6d9620e47a9be9695ae8c99d6807 7858 backoff_1.10.0-0kali1_source.buildinfo Checksums-Sha256: ede4231d6b381518bee1cf71fd5a9cf07d0e836359c625029e5d7752d0392e49 2064 backoff_1.10.0-0kali1.dsc 7f60a6354eea965bf766fb839386cd457835d7075253d603b8b7266447fcf1df 15546 backoff_1.10.0.orig.tar.gz 0cb6177e987f7064bce330f931af6d579c3c1a7967dc448e737403996d8f3d43 2820 backoff_1.10.0-0kali1.debian.tar.xz 7de456d237119acad584b7f0f0ffe8e804a12269ccf1e91575f89c42014b5e3c 7858 backoff_1.10.0-0kali1_source.buildinfo Files: 494595a964246c622ce6e0281ddf8132 2064 python optional backoff_1.10.0-0kali1.dsc 1f8b050b15a0a833f675cf5c01c09eee 15546 python optional backoff_1.10.0.orig.tar.gz bc21f418306bade5baf3567bc107a14b 2820 python optional backoff_1.10.0-0kali1.debian.tar.xz 44a591f8654f7c2e17b281c20a330ee7 7858 python optional backoff_1.10.0-0kali1_source.buildinfo -----BEGIN PGP SIGNATURE----- Comment: Signed by Sophie Brun iQIzBAEBCgAdFiEEOyG45orlwW+H9TItV5J4OyBv7jAFAl/aKQcACgkQV5J4OyBv 7jD+vg//f82fFILXt3G7NHmwFONS8TMuaxmUPPtzTB50BQ/8kF3ee8GGCqvojRqE 7odworcWOz83EHtcv5n3g4qNL2ChtaHGS482QjfWx7G1ZHklNtgUlou9K2a+OHQH 7rfpAsbY20mwdLQH/7Qw4ssWWOcOaCE5Y20XuzfoZwh7gm/LYcOWgSOoAMPwFavr sxkjcEC63/PnjrS+4FWH/qf5GxKf4/S52fLeBGrCxbWGbiXjB+74aXSmdd9C/e7Z ORcYm4V7P49v1VGEpINKMPjh96DTyodTj001CvFLN+NOg+t1JwSYSTQvMkqLaGPB AaGv+xj1S1Zwht9j9Pnx1vSDqBe7dKNEBwOYxSuSpmqfa6oWXttVnY6Qoe2q2lHd nz/04/293E0p6kaJ2JnQkmpCUQ393CV0t1r+fevUpWQGfED2E69D1+gUEFvt3HfZ iRK6f0Q+Mzqkwxy36nRdJ3Nfh1k/zisEbC7vtv+HK9RYUv66ZpeYpkkgL3N7eXVN CDECyHSQOjNH6auLzLX7hSX1oWC9oiikN8W+aJ81optX3GFCZkU/FsMXK0tNVIII OTZMrsQZsiWiobdbwICUza1KhCmokYl6z8cpQFZ7sIi6V7aGiG3e6UYgY3WgaZM8 m8PyK66kRTblQmP6LDhxDK7a0nbIkNcDviEld27DpWTPaEK6urw= =Akub -----END PGP SIGNATURE----- -- More information about backoff: http://pkg.kali.org/pkg/backoff