どうせそのうち不足ライブラリのチェックで引っかかると思うが必要だろうから先に入れる。

$ sudo installpkg n/gnupg-1.4.23-x86_64-4.txz
$ sudo installpkg n/gnupg2-2.2.33-x86_64-1.txz
$ sudo installpkg n/gnutls-3.7.2-x86_64-1.txz
不足libチェック&Inst：
https://seesaawiki.jp/lifewithslackzaurus_15_0/d/%a5%e9%a5%a4%a5%d6%a5%e9%a5%ea%a4%ceinstall%c9%d4%c2%ad%a4%ce%a5%c1%a5%a7%a5%c3%a5%af

(2022.10)
OpenSSLは、INSTALL_ORIG https://seesaawiki.jp/lifewithslackzaurus_15_0/d/INSTALL%5fORIG
でlibが入っているのでいいか、で入れなかったようだ。
よく見たら、TLSのlibもXをinstallした時に入っていて、後から上書きinstallしてたか。
まぁいいや。
($ sudo installpkg n/openssl-1.1.1m-x86_64-1.txz 必要になったら入れる)

参考情報：
OpenSSL、GnuPG、GnuTLS – Slackware-14.2 メモ
https://seesaawiki.jp/lifewithslackarmzaurus_15_0/d/OpenSSL%a1%a2GnuPG%a1%a2GnuTLS
OpenSSL、GnuPG – Slackware-12.0 spitz GPE メモ
https://seesaawiki.jp/lifewithslackzaurus/d/OpenSSL%a1%a2GnuPG
(wpa-supplicantがopensslに依存しているからそれだけは入れていたようだ)
OpenSSL、GnuPG – OpenZaurus-3.5.4.1 spitz GPE メモ
https://seesaawiki.jp/lifewithopenzaurus/d/OpenSSL%a1%a2GnuPG
セキュリティに関する情報 – ZDNet Japan
https://japan.zdnet.com/security/
Firefox のプライバシーに関する通知
https://www.mozilla.org/ja/privacy/firefox/
第2特集 実務に活かせるSSL/TLS入門 基本からおさらい，Let’s Encryptで実践
https://gihyo.jp/magazine/SD/archive/2021/202104
SlackwareでLet’s Encryptは難しいけどなんとかなった模様^^;
https://je1sgh.mydns.jp/je1sghblog/?p=6904

installまたは展開時のメッセージ：
\# gnupg (The GNU Privacy Guard)
\# GnuPG is GNU’s tool for secure communication and data storage. It can
\# be used to encrypt data and to create digital signatures. It includes
\# an advanced key management facility and is compliant with the proposed
\# OpenPGP Internet standard as described in RFC2440.
\
\# gnupg2 (The GNU Privacy Guard version 2.x)
\# GnuPG is GNU’s tool for secure communication and data storage. It can
\# be used to encrypt data and to create digital signatures. It includes
\# an advanced key management facility and is compliant with the proposed
\# OpenPGP Internet standard as described in RFC2440 and the S/MIME
\# standard as described by several RFCs.
\# GnuPG 2.x is the stable version of GnuPG integrating support for
\# OpenPGP and S/MIME. It does not conflict with an installed 1.4.x
\# OpenPGP-only version.
\
\# gnutls (GNU TLS library)
\# This is a TLS (Transport Layer Security) 1.0 and SSL (Secure Sockets
\# Layer) 3.0 implementation. In brief, GnuTLS can be described as a
\# library which offers an API to access secure communication protocols.
\# These protocols provide privacy over insecure lines, and were designed
\# to prevent eavesdropping, tampering, or message forgery.
\# Homepage: http://www.gnu.org/software/gnutls/