2022-04-14 19:13:46 +00:00
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.de1 INDENT
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2022-06-26 11:56:33 +00:00
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.TH "BORG-KEY-CHANGE-ALGORITHM" 1 "2022-06-26" "" "borg backup tool"
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2022-06-23 23:19:19 +00:00
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.SH NAME
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borg-key-change-algorithm \- Change repository key algorithm
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2022-04-14 19:13:46 +00:00
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.SH SYNOPSIS
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.sp
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2022-06-23 23:19:19 +00:00
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borg [common options] key change\-algorithm [options] ALGORITHM
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2022-04-14 19:13:46 +00:00
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.SH DESCRIPTION
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.sp
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Change the algorithm we use to encrypt and authenticate the borg key.
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.sp
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Important: In a \fIrepokey\fP mode (e.g. repokey\-blake2) all users share the same key.
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In this mode upgrading to \fIargon2\fP will make it impossible to access the repo for users who use an old version of borg.
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We recommend upgrading to the latest stable version.
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.sp
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Important: In a \fIkeyfile\fP mode (e.g. keyfile\-blake2) each user has their own key (in \fB~/.config/borg/keys\fP).
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In this mode this command will only change the key used by the current user.
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If you want to upgrade to \fIargon2\fP to strengthen security, you will have to upgrade each user\(aqs key individually.
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.sp
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Your repository is encrypted and authenticated with a key that is randomly generated by \fBborg init\fP\&.
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The key is encrypted and authenticated with your passphrase.
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.sp
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We currently support two choices:
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.INDENT 0.0
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.IP 1. 3
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argon2 \- recommended. This algorithm is used by default when initialising a new repository.
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The key encryption key is derived from your passphrase via argon2\-id.
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Argon2 is considered more modern and secure than pbkdf2.
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.IP 2. 3
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pbkdf2 \- the legacy algorithm. Use this if you want to access your repo via old versions of borg.
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The key encryption key is derived from your passphrase via PBKDF2\-HMAC\-SHA256.
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.UNINDENT
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.sp
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Examples:
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.INDENT 0.0
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.INDENT 3.5
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.sp
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.nf
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.ft C
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# Upgrade an existing key to argon2
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borg key change\-algorithm /path/to/repo argon2
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# Downgrade to pbkdf2 \- use this if upgrading borg is not an option
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borg key change\-algorithm /path/to/repo pbkdf2
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.ft P
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.fi
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.UNINDENT
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.UNINDENT
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.SH OPTIONS
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.sp
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See \fIborg\-common(1)\fP for common options of Borg commands.
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.SS arguments
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.INDENT 0.0
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.TP
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.B ALGORITHM
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select key algorithm
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.UNINDENT
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.SH SEE ALSO
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.sp
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\fIborg\-common(1)\fP
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.SH AUTHOR
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The Borg Collective
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