Is working for a company that provides information security services to banks and secures credit card data permissible or impermissible, and is it permissible to help my father with the expenses of Hajj from this money?

It is not permissible to work in the manufacturing, programming, or securing of interest-based bank cards, nor to assist in any way with them, whether they are debit or credit cards, due to the prohibition of riba (interest) and assisting in it. If the company provides IT security services for credit cards to interest-based banks, it is not permissible to work there, unless there is a permissible area of work within it, such as working on cards for Islamic banks or cards for company employees that are not related to riba. As for money earned from prohibited work before knowing its prohibition, there is no harm in using it to help one's father perform Hajj.