Key recovery mechanism for cryptographic systems

Abstract

A cryptographic system can include a register containing a key and a processor coupled to the register. The processor can be operable for performing a first encrypting operation, where the encrypting operation includes computing a key schedule using the register as a workspace. At the end of the first encrypting operation, the key is recovered from the register for use in a second encrypting operation.

Description

technical field [0001] In general, the subject matter of this application relates to cryptographic systems. Background technique [0002] The Advanced Encryption Standard (AES) is a National Institute of Standards and Technology technical specification for cryptographic algorithms that protect electronic data used in symmetric-key cryptography. The AES algorithm encrypts (encryptor) and decrypts (decryptor) information in the form of electronic data. Encryption converts electronic data into an incomprehensible form called ciphertext; decrypting the ciphertext converts electronic data back to its original form called plaintext. The AES algorithm is an iterative symmetric key block cipher capable of encrypting and decrypting electronic data in 128-bit blocks using cryptographic keys of 128, 192, and 256 bits. [0003] A public key cryptographic compiler can use a pair of cryptographic keys. However, the AES algorithm uses the same cryptographic key to encrypt and decrypt el...

AI Technical Summary

Problems solved by technology

This can result in additional handling and manipulation of cryptographic keys or key schedules

This additional handling and manipulation can compromise the secrecy of the key and its scheduling

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