Hash user emails in database?

Hashing is a one-way function, meaning you can’t get back an original string from a hash value.

You could use the PHP function mcrypt_encrypt to “encrypt” the email address and mcrypt_decrypt to convert it back.

If you went that route, you could hook into password_reset to decode the email address before the password reset is sent, and then hook into password_reset_after to encode it again after.

Related Posts:

  1. Multiple developers / editors working on a site in progress
  2. How many users can WordPress handle?
  3. Is sanitize_text_field() is enough to save to DB?
  4. How to track user progress?
  5. What is the most secure way to store post meta data in WP?
  6. Performance tips for a large user base [closed]
  7. Efficiency on displaying random authors based on large database
  8. Extend the wp_users table
  9. Using two different DB users on one WP install
  10. Is $wpdb->prepare escaping to much? How to use it properly?
  11. How to use user table of a different database for WordPress users?
  12. Subscribers to posts
  13. Set Display Name to first and last name (phpmyadmin SQL Query)
  14. Select Multiple meta_value from WP DB; Single Query
  15. Getting all the users who have author privilege
  16. Who is responsible for data sanitization in WordPress development?
  17. How do I properly update the WordPress database password?
  18. Does WordPress always create unique passwords?
  19. In what part of the WordPress core does the users table and usermeta table get joined?
  20. Why is it that not all users have a ‘session_tokens’ meta_key record in the usermeta table?
  21. Modify Database in Multi-Site wp_usermeta table
  22. Change WordPress prefix for only one table?
  23. wp_get_current_user always returns 0 continued
  24. Is there a smart way to obtain a list of only some selected user meta data?
  25. How can i customize the export personal data file?
  26. What Is the Proper Way to Merge Usermeta Table to a an existing WP Database?
  27. Import users from old WP site to new one
  28. How to Access wp_usermeta Data Immediately After a New User is Created
  29. Logins from WP users table use on another page
  30. WordPress and user security
  31. MS Access to manage WordPress Database
  32. 2 WordPress sites with 2 databases but sharing the same users
  33. Convert user passwords to MD5?
  34. What’s the proper way to sanitize checkbox value sent to the database
  35. What can I do when an outside party hacks into my weblog and changes my display name?
  36. How do I have now a duplicated user entry if this is not allowed (and I cannot replicate it)?
  37. Does WordPress store the username as a primary key in the database?
  38. Is there a way to execute a php script outside WordPress?
  39. multiple wordpress installation with shared usertable on an different database
  40. Best practice to import user base (subscribers) from one website to another?
  41. Share users across multiple sites on same database, but with different domains
  42. Users table missing from Database [closed]
  43. Some weird users in database
  44. How to delete a particular row in a database table
  45. Recovering the table wp_usermeta from users
  46. Regenerate user_nicename column
  47. WordPress security [closed]
  48. Storing user submitted forms [closed]
  49. WordPress where clauses in db select
  50. wp_insert_user not creating account correctly when ID is manually set
  51. Select From wpdb – Author/User Directory page
  52. Secure way to use name_save_pre?
  53. Can’t log into wordpress site – I have made a new user and still cant access
  54. Need help with creating a searchable user data by name or specific number like ID
  55. WordPress Database – wp_usermeta and the correct number of session_tokens rows
  56. Migrate Users From laravel to wordpress
  57. Insert NULL value using prepare()
  58. Display user data in numbered list
  59. User input to database
  60. how add more field to wp user and save it to database
  61. Move Non-WordPress users table to WordPress database
  62. Change user_nickname for author page link
  63. how restrict user to give star ratings once for a post?
  64. create a table using user meta custom data
  65. How to get the id of recently registered user from database?
  66. How to save dropdown slection by a user in the DB
  67. How to get specific table by current user login
  68. spambot registering without providing email or password, bypassing registration process
  69. update multiple user meta field based on another meta field
  70. Changed meta_key value in structures, now dashboard shows zero users
  71. What WordPress file is saving new users to database
  72. Get id from database
  73. WordPress sync with phpbb
  74. import (migration) user database to wp-users
  75. Import Excel (or csv) Table with user-data as subscribers to wordpress
  76. WP Multisite Users Not Linking
  77. How can I make a WordPress database portable and url independent?
  78. How to stop WordPress using utf8mb4_unicode_520_ci collation?
  79. WP_Options ID high
  80. Default WordPress settings API data sanitization
  81. How to fix unchanged URLs in Database after running serialized search and replace script?
  82. WordPress database error – Error in SQL syntax – I can’t identify any error?
  83. Merging two wp_posts tables while avoiding duplicates
  84. Move out of sync posts from one database to another
  85. Custom WordPress Table wpdb
  86. $wpdb->get_results($wpdb->prepare(… You have an error in your SQL syntax;
  87. Can local WordPress installs share /wp-content/ folder and database?
  88. how to encyrpt DB_PASSWORD in wp-config
  89. Choosing http or https during manual installation of WordPress and database
  90. Stringing together content from different databases
  91. Safely store code(html/js..) into database
  92. Why does wp_links still exist in the db schema?
  93. can’t upgrade wordpress or install plugins, it seems to “think” it’s still on a local installation
  94. Is there any defects for using same database prefix in WordPress for multiple sites?
  95. How to import products in host instead of database on wordpress?
  96. Want to update value in database. But it says update() on null
  97. The MySQL Connection could not be established., before it was joomla but i have change it into worpress
  98. Database Name Change
  99. Where To Find bb_profile_data(); In bbPress?
  100. How to properly configure SSL connection to remote azure database for running queries within a WordPress environment