Hawkynt

COMET-64-SPECK

NIST Lightweight Cryptography candidate providing authenticated encryption with 64-bit blocks. Uses SPECK-64/128 ARX cipher in CTR-like mode with 64-bit authentication tag.

Properties

Property	Value
Category	Authenticated Encryption
Sub-category	Lightweight AEAD
Security status	🧪 Experimental
Complexity	Intermediate
Inventor	Donghoon Chang, Mohona Ghosh, Kishan Chand Gupta, Arpan Jati, Abhishek Kumar, Dukjae Moon, Indranil Ray, Somitra Kumar Sanadhya
Year	2019
Origin	🇮🇳 India
Source	algorithms/aead/comet64-speck.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Nonce sizes	15 bytes (120 bits)
Tag sizes	8 bytes (64 bits)

Capabilities

Flag	Value
SupportsDetached	No

Security

Status: 🧪 Experimental

No vulnerabilities are recorded for this implementation.

Documentation

• Official COMET Website
• NIST LWC Finalist Specification
• NIST LWC Project Page
• GitHub Reference Implementation
• SPECK Specification

References

• NIST LWC Round 2 Submission Package (Reference C)

Test vectors

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

Vector 1 — NIST LWC KAT Count=1: Empty plaintext, empty AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	(empty)
input	(empty)
expected	d633b901593e5dfc

Vector 2 — NIST LWC KAT Count=2: Empty plaintext, 1-byte AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	00
input	(empty)
expected	9073a58ec98cd1c1

Vector 3 — NIST LWC KAT Count=3: Empty plaintext, 2-byte AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	0001
input	(empty)
expected	70c62ef9e8d20c2d

Vector 4 — NIST LWC KAT Count=9: Empty plaintext, 8-byte AD (full block)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	0001020304050607
input	(empty)
expected	67cab3fb65731afa

Vector 5 — NIST LWC KAT Count=17: Empty plaintext, 16-byte AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	000102030405060708090a0b0c0d0e0f
input	(empty)
expected	657684fb59323ae4

Vector 6 — NIST LWC KAT Count=34: 1-byte plaintext, empty AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	(empty)
input	00
expected	ccfd543f711a9794eb

Vector 7 — NIST LWC KAT Count=35: 1-byte plaintext, 1-byte AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	00
input	00
expected	e8c1b687b7fdc8d826

Vector 8 — NIST LWC KAT Count=42: 1-byte plaintext, 8-byte AD (full block)

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	0001020304050607
input	00
expected	6dd3a86775755daaad

Vector 9 — NIST LWC KAT Count=10: Empty plaintext, 9-byte AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	000102030405060708
input	(empty)
expected	459d3a0efd66e5ba

Vector 10 — NIST LWC KAT Count=6: Empty plaintext, 5-byte AD

Field	Value
key	000102030405060708090a0b0c0d0e0f
nonce	000102030405060708090a0b0c0d0e
associatedData	0001020304
input	(empty)
expected	eeb5cdf87a340dcb

---

← All algorithms

This site is open source. Improve this page.