I am uploading a NMU to DELAYED/10 in order to fix this.
Please find the debdiff attached.
diff -Nru ciphersaber-1.01/debian/changelog ciphersaber-1.01/debian/changelog
--- ciphersaber-1.01/debian/changelog 2023-10-02 22:26:08.000000000 +0200
+++ ciphersaber-1.01/debian/changelog 2023-10-02 22:23:41.000000000 +0200
@@ -1,3 +1,10 @@
+ciphersaber (1.01-2.2) unstable; urgency=medium
+
+ * Non-maintainer upload.
+ * Convert to source format 3.0 (Closes: #1007389).
+
+ -- Bastian Germann <b...@debian.org> Mon, 02 Oct 2023 22:23:41 +0200
+
ciphersaber (1.01-2.1) unstable; urgency=medium
* Non-maintainer upload.
diff -Nru ciphersaber-1.01/debian/patches/debian.patch
ciphersaber-1.01/debian/patches/debian.patch
--- ciphersaber-1.01/debian/patches/debian.patch 1970-01-01
01:00:00.000000000 +0100
+++ ciphersaber-1.01/debian/patches/debian.patch 2023-10-02
22:23:41.000000000 +0200
@@ -0,0 +1,19 @@
+--- ciphersaber-1.01.orig/t/bigfile.t
++++ ciphersaber-1.01/t/bigfile.t
+@@ -13,12 +13,15 @@ use_ok( 'Crypt::CipherSaber' );
+ my $cs = Crypt::CipherSaber->new( 'sdrawkcabsihtdaeR' );
+ open( INPUT, 'smiles.cs1' ) or die "Couldn't open: $!";
+ binmode(INPUT);
++my $mode = 0644;
++chmod( $mode, 'smiles.png' ) or die "Couldn't change permissions: $!";
+ open(OUTPUT, '> smiles.png') or die "Couldn't open: $!";
+ binmode(OUTPUT);
+ $cs->fh_crypt(\*INPUT, \*OUTPUT);
+ close INPUT;
+ close OUTPUT;
+-
++$mode = 0444;
++chmod( $mode, 'smiles.png' ) or die "Couldn't change permissions: $!";
+ open(TEST, 'smiles.png') or die "Couldn't open: $!";
+ my $line = <TEST>;
+
diff -Nru ciphersaber-1.01/debian/patches/series
ciphersaber-1.01/debian/patches/series
--- ciphersaber-1.01/debian/patches/series 1970-01-01 01:00:00.000000000
+0100
+++ ciphersaber-1.01/debian/patches/series 2023-10-02 22:23:41.000000000
+0200
@@ -0,0 +1 @@
+debian.patch
diff -Nru ciphersaber-1.01/debian/source/format
ciphersaber-1.01/debian/source/format
--- ciphersaber-1.01/debian/source/format 1970-01-01 01:00:00.000000000
+0100
+++ ciphersaber-1.01/debian/source/format 2023-10-02 22:23:34.000000000
+0200
@@ -0,0 +1 @@
+3.0 (quilt)
diff -Nru ciphersaber-1.01/t/bigfile.t ciphersaber-1.01/t/bigfile.t
--- ciphersaber-1.01/t/bigfile.t 2023-10-02 22:26:08.000000000 +0200
+++ ciphersaber-1.01/t/bigfile.t 2015-05-23 20:34:24.000000000 +0200
@@ -13,15 +13,12 @@
my $cs = Crypt::CipherSaber->new( 'sdrawkcabsihtdaeR' );
open( INPUT, 'smiles.cs1' ) or die "Couldn't open: $!";
binmode(INPUT);
-my $mode = 0644;
-chmod( $mode, 'smiles.png' ) or die "Couldn't change permissions: $!";
open(OUTPUT, '> smiles.png') or die "Couldn't open: $!";
binmode(OUTPUT);
$cs->fh_crypt(\*INPUT, \*OUTPUT);
close INPUT;
close OUTPUT;
-$mode = 0444;
-chmod( $mode, 'smiles.png' ) or die "Couldn't change permissions: $!";
+
open(TEST, 'smiles.png') or die "Couldn't open: $!";
my $line = <TEST>;
