2fa Command-line client for two-factor authenticationacme-client Client for issuing certificates from ACME-complaint serversacmesh Let's Encrypt ACME client in shell scriptadguardhome Powerful network-wide ads and trackers blocking DNS serverage Simple, modern and secure encryption toolaide Free intrusion detection system for checking file integrityaide06 Older intrusion detection system for checking file integrityaircrack-ng (V) WiFi security auditing tools suiteamap Applications and Services scanneramass In-depth Attack Surface Mapping and Asset Discoveryantonym Anonymous nymserver account maintenance toolap-modsecurity2 Intrusion detection and prevention engine for web applicationsap24-evasive Apache Evasive Maneuvers Moduleapg Tool set for random password generationargon2 Password hash Argon2arirang Powerful webserver security scannerasignify Yet another signify toolauthelia Single Sign-On Multi-Factor portal for web appsavcheck Mail content filter for SMTP serversBastille System hardening tool focusing on educating the userbcrypt Cross platform file encryption utilitybearssl Implementation of the SSL/TLS protocol (RFC 5246)beecrypt Multipurpose cryptographic librarybitstir Entropy restoration daemonbotan1 Portable, easy to use, and efficient C++ crypto library (v1)botan2 Portable, easy to use, and efficient C++ crypto library (v2)botan3 Portable, easy to use, and efficient C++ crypto library (v3)ca-certificates Root CA certificates from the Mozilla Projectcaff Various GnuPG related toolscargo-audit Audit Cargo.lock files for crates with security vulnerabilitiesccid Middleware to access a smart card using SCard API (PC/SC)cfs Encrypting file system, using NFS as its interfacecfssl CloudFlare PKI toolkitchkrootkit Locally checks for signs of a rootkitclamav Anti-virus toolkitclamav-doc Anti-virus toolkit documentsclusterssh Cluster administration toolcodecrypt Post-quantum cryptographic softwareCoolKey Driver support for the CoolKey and CAC productscourier-authlib Courier Authentication Librarycrack The Sensible Unix Password Crackercracklib Library used to enforce strong passwordscrypto++ Free C++ class library of Cryptographic Primitivescryptopassphrase Deterministic password generator based on scryptCSP Simple PKI Toolkitcvm Credential Validation Modulescy2-anonymous Cyrus SASL ANONYMOUS authentication plugincy2-crammd5 Cyrus SASL CRAM-MD5 authentication plugincy2-digestmd5 Cyrus SASL DIGEST-MD5 authentication plugincy2-gssapi Cyrus SASL GSSAPI authentication plugincy2-ldapdb Cyrus SASL LDAPDB authentication plugincy2-login Cyrus SASL LOGIN authentication plugincy2-ntlm Cyrus SASL NTLM authentication plugincy2-otp Cyrus SASL OTP authentication plugincy2-plain Cyrus SASL PLAIN authentication plugincy2-saml Crude SAML assertion validator for bridging WebSSO and SASLcy2-scram Cyrus SASL SCRAM authentication plugincy2-sql Cyrus SASL SQL authentication plugincyrus-sasl Simple Authentication and Security Layercyrus-sasl-xoauth2 XOAUTH2 mechanism plugin for cyrus-saslcyrus-saslauthd Cyrus SASL plaintext authentication daemond0_blind_id Library to perform identification using Blind RSA Signaturesdcfldd Enhanced version of GNU dd with features useful for forensicsddos-scan Scan for a limited set of distributed denial of service (ddos) agentsdefguard True Zero-Trust WireGuard VPN with 2FA/MFAdefguard-gateway True Zero-Trust WireGuard VPN with 2FA/MFAdefguard-proxy True Zero-Trust WireGuard VPN with 2FA/MFAdehydrated Letsencrypt/acme client implemented as a shell-scriptdestroy Program to securely destroy files on the hard diskdhbitty Small public key ECDH encryption/decryption programdirb Web Content Scannerdnssec-tools Toolkit to ease the deployment of DNSSEC related technologiesdnsx DNS toolkit designed for running DNS queriesdoas Execute commands as another userdropbear Small SSH2 server and client, aimed at embedded marketdsniff Password sniffer (webspy)dsniff-nox11 Password snifferduo-unix Duo two-factor authentication for Unix systemseasy-rsa CLI utility to build and manage a PKI CAecap_clamav_adapter eCAP ClamAV adapteregd EGD: Entropy Gathering Daemonent Entropy calculation and analysis of putative random sequenceserlang-epam Epam helper for Erlang / Elixir PAM authentication supporterlang-fast_tls TLS / SSL OpenSSL-based native driver for Erlang / Elixirerlang-jose JSON Object Signing and Encryptionerlang-p1_acme Erlang ACME client (RFC8555)erlang-p1_oauth2 Erlang Oauth2 implementationerlang-pkix PKIX certificates management library for Erlangettercap (V) Suite for man in the middle attacksfail2ban Scans log files and bans IP that makes too many password failuresflawfinder Python program to find flaws in C/C++ programsflawz TUI for browsing security vulnerabilitiesfprint-demo Simple GTK+ application to demonstrate libfprint's capabilitiesfsh Fast remote command executiongajim-plugin-omemo (V) OMEMO encryption support for Gajimgcr Library for crypto UI and related tasksgit-crypt Transparent file encryption in gitgit-secret Git subcommand to store your private data inside a git repositorygnome-keyring GNOME password and secret managergnu-crypto GPL implementation of the Java Crypto Extensions