lockbox | Modern encryption for Ruby and Rails | Encryption library

So my task is to clean up the data in a giant table, and create a linear regression model with the data. I noticed a problem that one of the columns store a bunch of tags in a string. The following snippet is two elements in that column.

I am currently trying to crack a programming puzzle that has the very simple dataframe host with 2 columns named city and amenities (both are object datatype). Now, entries in both columns could be repeated multiple times. Below is the first few entries of host is beLOW

I have an encrypted column :amount following using Lockbox that I need to sum in my controller.

Currently, I have -

I'm developing an overview of an electronic locker system for products with 5 slots. What I want to achive is to automaticly populate each "locker slot"'s dropdown and select the correct product in each slot.

There can also be mulitple lockers, so I dont know the best and the moste effectiv way to achive this.

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In Delphi 10.4 I am trying to encrypt string with RSA, using public key from certificate (*.cer). The problem is that, I do not know, how to pass this certificate to RSA function. I have feelings, that LockBox 3 have his own format to store public and private keys in a file.

I had wrote like this:

I ran bundle update rails and got this. I'm stumped. If activerecord-session_store 2.0 depends on a version of actionpack between 5.2.4.1 and above, and if actionpack is a dependency of Rails 6, shouldn't this be ok?

I'm trying to create a button that reveals text when clicked. But I also need a terms and conditions checkbox that disables the button until checked. Once the checkbox and button have both been clicked it would reveal the text. Here's what I have so far, but without the checkbox:

My app encrypts and uploads certain files, and then makes them visible to admins. To achieve the latter functionality, my encryption gem's documentation suggests a controller action that looks like this:

I have a Delphi 10.4 program with a clientdataset, loading XML files users choose with OpenFile dialog. It works just fine and depending on the contents of the XML, the fielddef structure is set automatically.

Now I want to be able to read Decrypted files and with ClientDataSet.SaveToFile, save Encrypted files.

Currently I'm using Lockbox 3.7 to Decrypt the chosen file, creating a temp file, which is then read by loadfromfile. Likewise Savetofile writes data back to a temp file, which is then encrypted and given it's chosen name. It works very well, but leaves the temp file on disk. And even if I delete the temp file in code, it's relatively easy to recover it, if you know how. So the security with Encryption like this, is not so high after all.

I would want to be able to perform the decryption directly in LoadFromFile (and similar encryption at SaveToFile) as a fileEn(or De)Crypt function, as suggested by the subject, without the use of temp files, but haven't been able to find any useful functions.

Do anybody know of such function ? If so, please point me in the right direction. The last couple of days I've been using google to search for something useful, but it has left me more confused and lost, than I feel I was before.

An alternative solution where the temp files created by the LockBox EnCryptFile (and DeCryptFile) are completely destroyed, to a point where no recovery is possible, would do as a temporary solution, so pointers to ways to destroy a file completely, would also be welcome.

Thanks in advance for any help I can get.