International Association for Cryptologic Research

International Association
for Cryptologic Research

CryptoDB

Eric Biggers

Affiliation: Google LLC

Publications

Year
Venue
Title
2018
TOSC
Adiantum: length-preserving encryption for entry-level processors
Paul Crowley Eric Biggers
We present HBSH, a simple construction for tweakable length-preserving encryption which supports the fastest options for hashing and stream encryption for processors without AES or other crypto instructions, with a provable quadratic advantage bound. Our composition Adiantum uses NH, Poly1305, XChaCha12, and a single AES invocation. On an ARM Cortex-A7 processor, Adiantum decrypts 4096-byte messages at 10.6 cycles per byte, over five times faster than AES-256-XTS, with a constant-time implementation. We also define HPolyC which is simpler and has excellent key agility at 13.6 cycles per byte.

Coauthors

Paul Crowley (1)