Patent ID: 8555068

Claim:
A system for end to end encrypted mobile telephony, the system comprising: a tamper resistant and tamper evident integrated circuit adapted to be coupled to a commodity mobile phone, the integrated circuit comprising a cryptographic engine, a programmable processor, a first cryptographic key and a nonvolatile memory, at least a portion of which is at least partially protected by the first cryptographic key; and software associated with the integrated circuit configured to be installed in the commodity mobile phone, the software, when installed in the commodity mobile phone, configured to operate in conjunction with the integrated circuit to, when the commodity mobile phone connects to a destination phone using a connection technique of the commodity mobile phone: receive a signal from the destination phone indicating that the destination phone is capable of cooperating to provide an encrypted connection; authenticate the destination phone; and establish an encrypted connection with the destination phone, whereby voice communications between the commodity mobile phone and the destination phone are encrypted end to end.