Cryptographic ASIC for key hierarchy enforcement

A cryptographic method for managing operations on an information stream, the method comprising:

• deriving a transform key from a temporary copy of a user passphrase;
• storing the transform key in a one-time programmable memory using programming pulses from external circuitry, with the transform key inaccessible from outside the cryptographic integrated circuit after being stored;
• processing an input message from the information stream by:
• hashing the input message;
• performing a customized transforming of the hash of the input message, with the transforming customized based on the transform key and comprising at least one of bit inversion and bit transposition, to obtain a transformed hash;
• and
• hashing the transformed hash into an output result;
• and
• creating the information stream based on the output result, wherein the information stream is a blockchain.

A cryptographic system for managing operations on an information stream, the system comprising:

• means for deriving a transform key from a temporary copy of a user passphrase;
• means for storing the transform key in a one-time programmable memory in using programming pulses from external circuitry, with the transform key inaccessible from outside the cryptographic integrated circuit after being stored;
• means for processing an input message from the information stream by hashing the input message, performing a customized transforming of the hash of the input message, with the transforming customized based on the transform key and comprising at least one of bit inversion and bit transposition, and hashing the transformed hash into an output result;
• and
• means for creating the information stream based on the output result, wherein the information stream is a blockchain.