Add Gronsfeld Cipher with Numeric Vigenère Support - #1842
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…git-only keys Implements the Gronsfeld cipher, a numeric variant of the Vigenère cipher where the key is a sequence of digits (0-9) instead of letters. Features full encrypt/decrypt with modular arithmetic, repeating key stream visualization, instrumented visualizer steps with per-character trace and numeric key display, and comprehensive unit tests including round-trips, edge cases, and comparison with Vigenère key space. 🤖 Generated with Codebuff Co-Authored-By: Codebuff <noreply@codebuff.com>
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…ipher # Conflicts: # lib/cipher/registry.ts # lib/cipher/types.ts
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closes #1841
Summary:
Implemented the Gronsfeld cipher with digit-only repeating keys and visualizer support.
Changes:
Added Gronsfeld encryption and decryption
Added digit-only key parsing and validation
Added repeating key stream handling
Added instrumented visualizer steps
Added key-stream visualization
Registered the cipher in the type definitions and registry
Added 30+ unit tests covering core functionality and edge cases
Kept changes conflict-free with existing cipher branches
Branch: feature/gronsfeld-cipher
Commit: 9186110