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LBlock

Lightweight 64-bit block cipher with 80-bit keys designed for resource-constrained environments. Uses 32-round Feistel network with 10 different 4-bit S-boxes. Optimized for both hardware and software implementations with low power consumption.

Properties

Property	Value
Category	Block Ciphers
Sub-category	Lightweight Block Cipher
Security status	🧪 Experimental
Complexity	Intermediate
Inventor	Wenling Wu, Lei Zhang
Year	2011
Origin	🇨🇳 China
Source	algorithms/block/lblock.js

Parameters

Parameter	Supported values
Key sizes	10 bytes (80 bits)
Block sizes	8 bytes (64 bits)

Security

Status: 🧪 Experimental

No vulnerabilities are recorded for this implementation.

Documentation

• LBlock Specification (ePrint Archive)
• ACNS 2011 Paper (Springer)

References

• openluopworld Lightweight Block Ciphers - LBlock (C)
• kmarquet/bloc LBlock Implementation (C)

Test vectors

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

Vector 1 — LBlock-80 Test Vector #1 (all zeros) - specification Appendix I

Field	Value
key	00000000000000000000
input	0000000000000000
expected	c218185308e75bcd

Vector 2 — LBlock-80 Test Vector #2 - specification Appendix I

Field	Value
key	0123456789abcdeffedc
input	0123456789abcdef
expected	4b7179d8ebee0c26

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