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Phillips Cipher

5x5 grid cipher with coordinate system and block transposition for educational cryptography study.

Properties

Property	Value
Category	Classical Ciphers
Sub-category	Grid Cipher
Security status	🎓 Educational Only
Complexity	Intermediate
Inventor	Unknown
Year	1850
Origin	❓ Unknown
Source	algorithms/classical/phillips.js

Security

Status: 🎓 Educational Only

No vulnerabilities are recorded for this implementation.

Documentation

• CryptoCrack: Phillips Cipher User Guide
• CWU Kryptos Challenge: Phillips Cipher (PDF)

References

• dcode.fr: Phillips Cipher (online encoder/decoder)
• CryptoPrograms: Phillips Cipher Generator

Test vectors

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

Vector 1 — Self-computed vector (standard Polybius square, self-consistency check - not an official Phillips cipher test vector)

Field	Value
input	48454c4c4f
expected	3233203135203331203331203334

Vector 2 — Self-computed vector (standard Polybius square, self-consistency check - not an official Phillips cipher test vector)

Field	Value
input	574f524c44
expected	3532203334203432203331203134

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