sensor embedded in the button.
Data used for verification is encrypted and stored in a secure enclave of the iPhone 5S' A7 processor chip.
Two security experts who sponsored an impromptu competition offering cash and other prizes to the first hackers who cracked the iPhone said they had reviewed the information posted on the CCC website, but wanted more documentation.
"We are simply awaiting a full video documentation and walk through of the process that they have claimed," said mobile security researcher Nick DePetrillo, who started the contest with another security expert, Robert Graham. "When they deliver that video we will review it."
The two of them each put up $100 toward a prize for the contest winner, then set up a website inviting others to contribute. While the booty now includes more than $13,000 in cash, it was not clear that the CCC would receive the full payout, even if DePetrillo and Graham declared them winners.
A micro venture capital firm known as I/O Capital, which had offered to pay $10,000 of the prize money, issued a press release late on Sunday saying that it would make its own determination about who won the contest.