Yeah, it should be something like: "A private key is nothing but a number roughly between 1 and 2^256, that is only known by you. This number is usually pseudor

Yeah, it should be something like: "A private key is nothing but a number roughly between 1 and 2^256, that is only known by you. This number is usually pseudorandomly generated by your bitcoin client, but it could be generated in any way. The important thing is that it is an uncommon large number, that others will not be able to easily guess."