From: Collin Funk <collin.funk1@gmail.com>
Date: Sun, 23 Nov 2025 20:44:23 +0000 (-0800)
Subject: doc: cksum: document secure hash algorithms
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=b1ccb268b12f66eae6c09d833d68dd9ed40ad7b7;p=thirdparty%2Fcoreutils.git

doc: cksum: document secure hash algorithms

* doc/coreutils.texi (cksum general options): Mention hash algorithms
that are currently considered secure against malicious tampering.
---

diff --git a/doc/coreutils.texi b/doc/coreutils.texi
index 214b21b563..098fa4761a 100644
--- a/doc/coreutils.texi
+++ b/doc/coreutils.texi
@@ -4229,6 +4229,15 @@ Supported more modern digest algorithms are:
 @samp{sm3}       only available through @command{cksum}
 @end example
 
+The following algorithms are currently considered secure against
+malicious tampering, i.e., there is no known way to modify a file to
+produce the same checksum:
+@example
+@samp{sha2}      equivalent to @command{sha@{224,256,384,512@}sum}
+@samp{sha3}      only available through @command{cksum}
+@samp{blake2b}   equivalent to @command{b2sum}
+@end example
+
 @item --base64
 @opindex --base64
 @cindex base64 checksum encoding