Addressing your premise, which is that it doesn't exist, by which you are implying that it is some great difficulty in creating this thing which doesn't exist, but which is in fact what Apple does routinely.
Do *YOU* grasp the problem here? A Lock Smith can MAKE a key. You know, like one that DOESN'T CURRENTLY EXIST! Then it would exist! Then there would be a Key!
...it would take the Apple team about 15 minutes to do what they FBI has asked, and what a Judge has now ORDERED them to do.
It also wouldn't be worth a billion dollars.
"Locks" and "keys" are METAPHORS for mathematical encryption equations. If all they had to do was find a "locksmith," the government could do it on their own. Apple is NOT being asked to make a "key" - THERE IS NO REPLACEMENT KEY. They are being asked to make a "replacement lock." And then SUBSTITUTE that lock for the "locked lock" so that the original, mathematically hidden key, can unlock it. That is a HUGE undertaking! "15 minutes" only displays your MASSIVE ignorance of this issue. And as for the value, yeah, creating a gigantic replacement OS that could be swapped for any locked iPhone in the world to crack it WOULD be worth a billion dollars, if not MUCH more. Not to mention the legal precedent would be horrendous.
Watch who you call dishonest. It's dishonest to wade into a discussion without knowing what the hell you're talking about, too - especially when you're arguing for the permanent enlargement of totalitarian governmental power and the obliteration of personal security.
I have been going round and round with DiogenesLamp. I have come to the conclusion he believes that Apple is inherently evil and that he believes there is a MAGIC solution to the problem and that Apple is hiding it. In his world view, Apple already knows how to unlock the iPhone, or it is an established fact that it is trivial thing to do, and Apple is maliciously refusing to unlock it because they are evil sodomites. Everything Apple does, in DiogenesLamp's viewpoint, is evil.
Therefore, anyone who supports the position that it is difficult to do, or that Apple has good and legitimate Constitutional reasons for refusing, is lying and/or dishonest.
He has been pounding this tin drum of his through several threads, despite any attempt to disabuse him of his delusions. He thinks his opinions equal facts.
He found ONE blog that calls itself a security site called "Trail of Bits," that claims Apple could easily unlock the iPhone in question, even though the comments on that site basically eviscerated the author's opinion, as do most others who know what they are talking about. He refuses to recognize basic facts. The fact is that it is DiogenesLamp who is delusional in his hatred for Apple. It becomes quite clear.
It should be mentioned that the "LOCK" in this instance is hard-coded into the SECURE ELEMENT of most iPhones. In this particular iPhone 5C, it does happen to exist in software. On later models, it is burned into the silicon. . . and cannot be overwritten. On the iPhone 5C, it would require a FIRM WARE UPDATE, which also requires a hard reset, which requires a RESTORE from an iTUNES BACKUP. If I recall correctly, the user has to sync the iPhone to iTunes first, do the firmware update, then RESTORE the data back to the iPhone. . . and to do all that, the user has to FIRST BE LOGGED IN WITH THE USER'S PASSCODE! This is part of the Secure Boot System. OOPS!
That's why that so-called security site Blogger's idea wouldn't work. He wanted Apple to write a new version of the Firm ware that forced the iPhone to ignore the SECURE BOOT STARTUP and use a new startup that did not check for the passcode input timers to allow unlimited passcode inputs without timing out, and to also allow passcodes to be input through the lightning port, so they could be input as fast as the lightning port could accept them, by passing the requirement they had to be input from the touchscreen. But, since the only way to install new firmware is outlined in my first paragraph, no can do.