I think it is possible to generate keys in a offline computer and sign. To create a transaction I need input transactions detail, and somehow I have to transfer signed transaction from offline computer to a online computer to relay the transaction.
Is it possible to do this without using USB storage? I can use keyboard, or barcode reader to transfer input transaction hash to offline computer and signed transaction back to online computer. So that private key stays with offline computer.
Could you provide step-by-step instructions to do this, with any required error check / correction ?