JOSEKI (cipher)

JOSEKI (cipher)

The JOSEKI algorithm is actually a pair of related algorithms for the encryption and decryption of secret algorithms stored in firmware. The bootstrap code uses a key stored in non-volatile memory to decrypt the operating system code stored encrypted in ROM.

If the physical device is compromised, the firmware cannot be erased and is subject to reverse-engineering. If the firmware is encrypted and the decryption key has been erased, the code so protected is still secure. It is a National Security Agency Type 1 algorithm.

References

JOSEKI-1, A Bootstrap Procedures, National Security Agency, R21-TECH-0062-92, 7 Oct 92 (US Government Information Classification: Secret)

An Implementer’s Guide to JOSEKI-1: A Bootstrap Procedure, National Security Agency, R21-TECH-013-97, 9 April 1997 (US Government Information Classification: Secret/Releasable)

Enhancements to the JOSEKI-1 Bootstrap Procedure, National Security Agency, R21-TECH-013-98, 8 June 1998 (US Government Information Classification: Secret/Releasable)


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