I've never used Microsoft Access personally, but from your link, it sounds like it simply encrypts/decrypts your entire database using your passphrase. Blesta encrypts some individual fields in the database, but not the entire database. The two are very different.
I'm not sure what kind of security audit you're referring to, but I imagine that seeing password fields and credit card information as encrypted text is the expected result of a security audit. If there were a "hack" stored in an encrypted field, then you have vulnerabilities elsewhere that require attention.
Encryption occurs internally to Blesta. There is no separate solution crafted for the purpose of encrypting/decrypting data outside of Blesta. Such a solution would require knowledge of its presumed use, which is knowledge we don't possess.