HMAC (3ssl)          - HMAC message authentication code
PAM (7)              - Pluggable Authentication Modules for Linux
Apache2::Access (3pm) - A Perl API for Apache request object: Access, Authent...
Apache::AuthDBI (3pm) - Authentication and Authorization via Perl's DBI
apt-secure (8)       - Archive authentication support for APT
auth_destroy (3)     - library routines for remote procedure calls
Authen::PAM (3pm)    - Perl interface to PAM library
Authen::PAM::FAQ (3pm) - Frequently-Asked Questions about Authen::PAM.
Authen::SASL (3pm)   - SASL Authentication framework
Authen::SASL::Perl (3pm) - - Perl implementation of the SASL Authentication f...
Authen::SASL::Perl::ANONYMOUS (3pm) - Anonymous Authentication class
Authen::SASL::Perl::CRAM_MD5 (3pm) - CRAM MD5 Authentication class
Authen::SASL::Perl::DIGEST_MD5 (3pm) - Digest MD5 Authentication class
Authen::SASL::Perl::EXTERNAL (3pm) - External Authentication class
Authen::SASL::Perl::GSSAPI (3pm) - GSSAPI (Kerberosv5) Authentication class
Authen::SASL::Perl::LOGIN (3pm) - Login Authentication class
Authen::SASL::Perl::PLAIN (3pm) - Plain Login Authentication class
Authen::Simple (3pm) - Simple Authentication
Authen::Simple::Adapter (3pm) - Adapter class for implementations
Authen::Simple::Apache (3pm) - PerlAuthenHandler handler for Apache
Authen::Simple::Log (3pm) - Simple log class
Authen::Simple::PAM (3pm) - Simple PAM authentication
Authen::Simple::Password (3pm) - Simple password checking
authnone_create (3)  - library routines for remote procedure calls
authorized_keys (5)  - OpenSSH SSH daemon
authunix_create (3)  - library routines for remote procedure calls
authunix_create_default (3) - library routines for remote procedure calls
cfg80211_auth_timeout (9) - notification of timed out authentication
cfg80211_tx_mlme_mgmt (9) - notification of transmitted deauth/disassoc frame
corosync-keygen (8)  - Generate an authentication key for Corosync.
crypto_aead_authsize (9) - obtain maximum authentication data size
crypto_aead_setauthsize (9) - set authentication data size
Digest::HMAC (3pm)   - Keyed-Hashing for Message Authentication
Digest::HMAC_MD5 (3pm) - Keyed-Hashing for Message Authentication
Digest::HMAC_SHA1 (3pm) - Keyed-Hashing for Message Authentication
doveadm-auth (1)     - Test authentication for a user
fail2ban (1)         - a set of server and client programs to limit brute for...
git-blame (1)        - Show what revision and author last modified each line ...
git-mailinfo (1)     - Extracts patch and authorship from a single e-mail mes...
hmac (3ssl)          - HMAC message authentication code
HMAC_cleanup (3ssl)  - HMAC message authentication code
HMAC_Final (3ssl)    - HMAC message authentication code
HMAC_Init (3ssl)     - HMAC message authentication code
HMAC_Update (3ssl)   - HMAC message authentication code
htdigest (1)         - manage user files for digest authentication
HTML::Mason (3pm)    - High-performance, dynamic web site authoring system
htpasswd (1)         - Manage user files for basic authentication
iceauth (1)          - ICE authority file utility
LWP::Authen::Ntlm (3pm) - Library for enabling NTLM authentication (Microsoft...
Mail::DKIM::AuthorDomainPolicy (3pm) - represents an Author Domain Signing Pr...
mcookie (1)          - generate magic cookies for xauth
Module::Build::API (3perl) - API Reference for Module Authors
Module::Build::Authoring (3perl) - Authoring Module::Build modules
pam (3)              - Pluggable Authentication Modules Library
pam (7)              - Pluggable Authentication Modules for Linux
pam-auth-update (8)  - manage PAM configuration using packaged profiles
pam_authenticate (3) - account authentication
pam_chauthtok (3)    - updating authentication tokens
pam_get_authtok (3)  - get authentication token
pam_get_authtok_noverify (3) - get authentication token
pam_get_authtok_verify (3) - get authentication token
pam_sm_authenticate (3) - PAM service function for user authentication
pam_sm_chauthtok (3) - PAM service function for authentication token management
pam_timestamp (8)    - Authenticate using cached successful authentication at...
pam_unix (8)         - Module for traditional password authentication
pam_unix2 (8)        - Standard PAM module for traditional password authentic...
pam_userdb (8)       - PAM module to authenticate against a db database
pam_xauth (8)        - PAM module to forward xauth keys between users
pam_xauth_data (3)   - structure containing X authentication data
pure-authd (8)       - External authentication agent for Pure-FTPd.
rpc_clone_client_set_auth (9) - Clone an RPC client structure and set its auth
SET_SESSION_AUTHORIZATION (7) - set the session user identifier and the curre...
slapauth (8)         - Check a list of string-represented IDs for LDAP authc/...
ssh-add (1)          - adds private key identities to the authentication agent
ssh-agent (1)        - authentication agent
ssh-copy-id (1)      - use locally available keys to authorise logins on a re...
ssh-keygen (1)       - authentication key generation, management and conversion
ssh-keysign (8)      - ssh helper program for host-based authentication
struct_cfg80211_auth_request (9) - Authentication request data
struct_cfg80211_deauth_request (9) - Deauthentication request data
svcerr_auth (3)      - library routines for remote procedure calls
svcerr_weakauth (3)  - library routines for remote procedure calls
ts (1ssl)            - Time Stamping Authority tool (client/server)
X11::Auth (3pm)      - Perl module to read X11 authority files
xdr_authunix_parms (3) - library routines for remote procedure calls
xdr_opaque_auth (3)  - library routines for remote procedure calls