Hawkynt

ISAP-A-128A

Side-channel resistant AEAD using Ascon permutation with 12/6/1 round configuration. Designed to protect against power analysis and timing attacks through limited permutation calls per key bit.

Properties

Property	Value
Category	Authenticated Encryption
Sub-category	Authenticated Encryption
Security status	🛡️ Secure
Complexity	Advanced
Inventor	Christoph Dobraunig, Maria Eichlseder, Stefan Mangard, Florian Mendel, Robert Primas
Year	2017
Origin	Not specified
Source	algorithms/aead/isap.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Tag sizes	16 bytes (128 bits)

Capabilities

Flag	Value
SupportsDetached	No

Security

Status: 🛡️ Secure

No vulnerabilities are recorded for this implementation.

Documentation

• ISAP v2.0 Specification
• NIST LWC Finalist
• ISAP Paper (ToSC 2017)
• BouncyCastle Reference

References

• ISAP Official Code Package (reference implementation)
• ISAP C++ Implementation (itzmeanjan)
• NIST LWC Finalists Implementations (rweather)

Test vectors

5 vectors ship with this algorithm and run in the test suite. Byte values are hexadecimal.

Vector 1 — ISAP-A-128A: Empty PT, Empty AD (NIST LWC KAT Count=1)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
associatedData	(empty)
input	(empty)
expected	7b94ef35ae55ab272c9c44d6c1cf0102

Vector 2 — ISAP-A-128A: Empty PT, 1-byte AD (NIST LWC KAT Count=2)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
associatedData	00
input	(empty)
expected	40fead6fdf1c2d6d6eae40deddff9f55

Vector 3 — ISAP-A-128A: Empty PT, 8-byte AD (NIST LWC KAT Count=9)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
associatedData	0001020304050607
input	(empty)
expected	7ae5f96bd1ae7f5b08fa85177750b6b3

Vector 4 — ISAP-A-128A: 1-byte PT, Empty AD (NIST LWC KAT Count=34)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
associatedData	(empty)
input	00
expected	2cfacf138c6fdbbcc8763a7205fd66316d

Vector 5 — ISAP-A-128A: 8-byte PT, 8-byte AD (NIST LWC KAT)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e0f
associatedData	0001020304050607
input	0001020304050607
expected	2cde28dbbbd9131e4270dfff9b0c36c0824e86d98daed276

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