Hawkynt

IDEA

International Data Encryption Algorithm by Lai and Massey. Uses Lai-Massey structure with three operations: XOR, addition mod 2^16, and multiplication mod (2^16+1). Patent expired 2011.

Properties

Property Value
Category Block Ciphers
Sub-category Block Cipher
Security status 🎓 Educational Only
Complexity Intermediate
Inventor Xuejia Lai, James L. Massey
Year 1991
Origin 🇨🇭 Switzerland
Source algorithms/block/idea.js

Parameters

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

Security

Status: 🎓 Educational Only

Known vulnerabilities

Issue Description Mitigation
Patent History Algorithm was patented until 2011, limiting adoption. Patent-free since 2011. Use AES for new applications requiring standardized algorithms

Documentation

References

Test vectors

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

Vector 1 — NESSIE IDEA ECB test vector - all zeros

Field Value
key 00000000000000000000000000000000
input 0000000000000000
expected 0001000100000000

Vector 2 — NESSIE IDEA ECB test vector - high bit plaintext

Field Value
key 00000000000000000000000000000000
input 8000000000000000
expected 8001000180008000

Vector 3 — Botan idea.vec - classic ISO/IEC 18033-3 sample, counting plaintext

Field Value
key 00010002000300040005000600070008
input 0000000100020003
expected 11fbed2b01986de5

Vector 4 — Botan idea.vec - classic sample, sequential plaintext

Field Value
key 00010002000300040005000600070008
input 0102030405060708
expected 540e5fea18c2f8b1

Vector 5 — Botan idea.vec - random key/plaintext pair

Field Value
key ed1bcc9e9267925f3132ba3a8cf9b764
input 7409000000000000
expected e18315c171b83765

Vector 6 — Botan idea.vec - multi-block ECB chain

Field Value
key 00010002000300040005000600070008
input 000000010002000301020304050607080019324b647d96aff5202d5b9c671b08
expected 11fbed2b01986de5540e5fea18c2f8b19f0a0ab6e10ced78cf18fd7355e2c5c5

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