Write & Read RFID RC522 using Bascom AVR (or Arduino) – Mifare Classic 1k

General information for the business: Vending Machine Manufacturer & Operator
Kind of development: Customization of existing program
Description of requirements/functionality: Write & Read RFID RC522 using Bascom AVR (or Arduino) – Mifare Classic 1k
We are going to develop a payment using RFID System. Using atmega 328p/ arduino uno & NXP RC 522.
Need someone to develop software using Bascom AVR (or Arduino) with this details :
1. Card Encryption,modify KEY A & KEY B, etc. So can not easily read inside memory
2. WRITE : Add “number” inside the memory, with several encryption. (discuss later).
Ex : number 56789 become “43131343” to write in the memory
3. READ the file inside mifare classic tag and decrypt it
Ex : number “43131343” then decrypt become 56789
4. Show in the lcd 16x2 – i2c connection.
All the library already available in arduino & Bascom. Only need to modify several part, especially change the KEY A and KEY B.
Extra notes: