From Xojo Documentation
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Encrypts the database using encryptionKey as the password. If you are already connected to an encrypted database and call Encrypt with an empty string, the database is decrypted.
AES-256 encryption is used starting with 2018r1. Before that, AES-128 encryption was used.
If you have a database that was previously encrypted as AES-128 and would like to switch to AES-256, first remove the encryption using Decrypt and then encrypt it again with Encrypt.