Why Does AES_DECRYPT() Return an Empty Result in MySQL?

Troubleshooting AES_DECRYPT Failure in MySQL

When attempting to decrypt data previously encrypted with AES_ENCRYPT(), you may encounter an issue where AES_DECRYPT() returns an empty result. This can be frustrating, as your encrypted data remains inaccessible.

According to the MySQL documentation, AES_DECRYPT() is expected to return the original string após decrypting an encrypted string. However, in some cases, it may return a binary string instead.

To resolve this issue, try the following:

SELECT *,
       CAST(AES_DECRYPT(first_name, 'usa2010') AS CHAR(50)) first_name_decrypt
FROM   user

This query uses the CAST() function to convert the decrypted binary string to a CHAR string, which can be displayed properly. Instead of using "first_name" in your subsequent queries or applications, use "first_name_decrypt" to access the decrypted data.

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