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  2. multiOTP - Wikipedia

    en.wikipedia.org/wiki/MultiOTP

    multiOTP is an open source PHP class, a command line tool, and a web interface that can be used to provide an operating-system-independent, strong authentication system. multiOTP is OATH-certified since version 4.1.0 and is developed under the LGPL license.

  3. Email authentication - Wikipedia

    en.wikipedia.org/wiki/Email_authentication

    Email authentication, or validation, is a collection of techniques aimed at providing verifiable information about the origin of email messages by validating the domain ownership of any message transfer agents (MTA) who participated in transferring and possibly modifying a message.

  4. Referential integrity - Wikipedia

    en.wikipedia.org/wiki/Referential_integrity

    For referential integrity to hold in a relational database, any column in a base table that is declared a foreign key can only contain either null values or values from a parent table's primary key or a candidate key. [2] In other words, when a foreign key value is used it must reference a valid, existing primary key in the parent table.

  5. Data validation - Wikipedia

    en.wikipedia.org/wiki/Data_validation

    Data validation is intended to provide certain well-defined guarantees for fitness and consistency of data in an application or automated system. Data validation rules can be defined and designed using various methodologies, and be deployed in various contexts. [1]

  6. Prepared statement - Wikipedia

    en.wikipedia.org/wiki/Prepared_statement

    Major DBMSs, including SQLite, [5] MySQL, [6] Oracle, [7] IBM Db2, [8] Microsoft SQL Server [9] and PostgreSQL [10] support prepared statements. Prepared statements are normally executed through a non-SQL binary protocol for efficiency and protection from SQL injection, but with some DBMSs such as MySQL prepared statements are also available using a SQL syntax for debugging purposes.

  7. Why did I receive an email from MAILER-DAEMON? - AOL Help

    help.aol.com/articles/what-is-a-mailer-daemon...

    The most common reason for a failed delivery is that the email address entered isn't valid. If the delivery failure message says the account doesn't exist double check the spelling of the address you entered. A single misplaced letter could cause a delivery failure.

  8. List of Apache modules - Wikipedia

    en.wikipedia.org/wiki/List_of_Apache_modules

    mod_authnz_mysql: Version 2.2: This module provides both authentication and authorization for the Apache 2.2 webserver like mod-authnz-ldap . It uses a MySQL database to retrieve user and group informations. mod_backhand: Version 1.3: Third-party module: Yair Amir, Theo Schlossnagle: Seamless redirection of HTTP requests from one web server to ...

  9. Digest access authentication - Wikipedia

    en.wikipedia.org/wiki/Digest_access_authentication

    The table of HA1 values must therefore be protected as securely as a file containing plaintext passwords. [ 12 ] Digest access authentication prevents the use of a strong password hash (such as bcrypt ) when storing passwords (since either the password, or the digested username, realm and password must be recoverable)