so for my project I will write a super strong encription system. it will use a private key for the security and it will automatically write the strings and numbers to memory. the security key must not be in the memory coz it could be taken by people. so I will keep it to registers in the centrel processing core. the core has 8 registers and I will only take 2 for the secret key. how tell the compierl to leave my registers. I trhink there must be a pragma to say what it can use but where is it. did they forget it. this is very difficult problem. only answer if you can share me the knowledge and help. if you have code tell me. I will let you know my e mail and you must send it it here. it must be secret don't tell any body.
well, where does the encryption come from? if "kept in a register" it is lost at power off
I expect he stores the crypto key in some external EEPROM, but protected using strong 16-bit encryption and possibly a 5-character one-word english pass phrase. So the program loads and decrypts the crypto key so it then in two 8-bit registers can keep the ultra-safe crypto key used for the real data processing.