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Adiantum: length-preserving encryption for entry-level processors
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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.
Universitatsbibliothek der Ruhr-Universitat Bochum
Title: Adiantum: length-preserving encryption for entry-level processors
Description:
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.
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