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SIMECK-64

Lightweight 64-bit block cipher combining design principles from SIMON and SPECK. Uses efficient AND-rotation-XOR round function suitable for hardware implementations in resource-constrained devices.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Lightweight Block Cipher
Security status	Not classified
Complexity	Intermediate
Inventor	Gangqiang Yang, Bo Zhu, Valentin Suder, Mark D. Aagaard, Guang Gong
Year	2015
Origin	🇨🇦 Canada
Source	algorithms/block/simeck.js

Parameters

Parameter	Supported values
Key sizes	16 bytes (128 bits)
Block sizes	8 bytes (64 bits)

Security

Status: not classified — treat as unverified.

No vulnerabilities are recorded for this implementation.

Documentation

• The Simeck Family of Lightweight Block Ciphers
• Crypto++ SIMECK Implementation

References

• Bo Zhu Simeck Reference Implementation (C/Python)
• DFA_Simeck Implementation (C)

Test vectors

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

Vector 1 — SIMECK-64 Official Test Vector

Field	Value
key	1b1a1918131211100b0a090803020100
input	656b696c20646e75
expected	45ce69025f7ab7ed

Vector 2 — SIMECK-64 Reference Vector #2

Field	Value
key	0938251f43bb8ba606b747de870c3e99
input	f1bbe9ebe16cd6ae
expected	4d11c6b9da2f7e28

Vector 3 — SIMECK-64 Reference Vector #3

Field	Value
key	323ba122444066d09e7d49dc407836fd
input	1cdbae3296f5453b
expected	1e6a0792f5a717c5

Vector 4 — SIMECK-64 Reference Vector #4

Field	Value
key	61ff698f2ddc8e6653bf67d699d5e980
input	b9729d49e18b1fda
expected	fca0fa8194bda9c7

Vector 5 — SIMECK-64 Reference Vector #5

Field	Value
key	cfd3902d597e35cf9e0cf4d52c53cbc9
input	844f4a779d9c1672
expected	562b1caa75266241

Vector 6 — SIMECK-64 Reference Vector #6

Field	Value
key	f8466a046454ceb13b33821fd4618dbe
input	78818744e6d91d2a
expected	d946fa4941516d8e

Vector 7 — SIMECK-64 Reference Vector #7

Field	Value
key	97278a5928ce0bf52543e53cadae2488
input	d0576876162f6768
expected	ca3e5050126fa61b

Vector 8 — SIMECK-64 Reference Vector #8

Field	Value
key	a786c2b5c19be1c0978c2ff11128c18c
input	08614014c9cd68d4
expected	a307ab5aa10f5c29

Vector 9 — SIMECK-64 Reference Vector #9

Field	Value
key	63b126df89a982790c9bb4479cfed971
input	d96ca166d923d155
expected	5e47b40d9854418a

Vector 10 — SIMECK-64 Reference Vector #10

Field	Value
key	463608dc1b2861c93f41078428a11e20
input	3f895ef162e09612
expected	c5fd5a6c32056800

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