Cryptanalysis Toolkit v1.2

Professional Cipher Workbench for Historical Cryptography

Fourteen classical algorithms with integrated analysis engines. Frequency histograms, index of coincidence calculation, Kasiski examination, and chi-squared scoring for systematic plaintext recovery.

Cipher Systems

100%

Offline Mode

Challenges

Download Avreno Updated 08.09.2026 – Zero telemetry architecture

Verification Protocol Selection

Cipher Alpha

Core Algorithm Package

Seven substitution ciphers included
Frequency analysis module
Twelve starter challenges

Activate Package

Cipher Master

⏱ Full Unlock

Complete Cryptanalysis Suite

All fourteen classical ciphers
Advanced statistical tools: IoC, Kasiski, chi-squared
Full challenge set with hints

Download Full Version

Daily Mode

Training Cipher Series

New cipher every 24 hours
Progressive difficulty scaling
Solution timeline tracking

Enable Daily Mode

All features operate entirely offline. No external authentication required.

Technical Architecture Overview

Algorithmic Foundation

Avreno implements fourteen historical cipher systems spanning substitution and transposition categories. The substitution block includes Caesar, Atbash, Affine, keyword-based monoalphabetic, Vigenère polyalphabetic, Beaufort autokey, Playfair digraph, Polybius square, Nihilist numerical, and Bacon biliteral methods.

Statistical Analysis Layer

The integrated analysis engine computes frequency distributions with histogram visualization, calculates index of coincidence for polyalphabetic detection, executes Kasiski examination for key-length determination, and applies chi-squared scoring against target language models for plaintext validation.

Interface Methodology

The Alphabet Rail mechanism provides physical manipulation of character mappings with haptic confirmation at optimal alignment points. Case file architecture preserves evidence photographs, ciphertext transcriptions, analysis session data, and solution timelines with export functionality for documentation purposes.

Verified Specifications

Platform	iOS native application
Version	1.2 (September 2026)
Network Requirements	Zero – fully offline operation
Cipher Count	14 classical systems
Analysis Tools	Frequency, IoC, Kasiski, χ²
Challenge Library	24 tiered exercises
Data Collection	None – local processing only
Account System	Not required

Operational Procedures

Decryption Workflow

Photograph or manually transcribe ciphertext into workbench input field
Select appropriate algorithm from fourteen cipher options based on initial assessment
Apply automated frequency analysis to identify character distribution patterns
Execute statistical tests: compute IoC value to distinguish monoalphabetic from polyalphabetic
For polyalphabetic: run Kasiski examination to determine probable key length
Utilize Alphabet Rail interface for manual key adjustment with real-time decryption preview
Monitor chi-squared scoring to validate plaintext likelihood against English language model
Preserve complete solution path within case file for reference

Analysis Module Functions

Frequency histogram: bar chart visualization of character occurrence rates
Index of Coincidence: numerical probability metric for cipher type classification
Kasiski examination: automatic identification of repeated n-gram sequences for key-length calculation
Chi-squared test: statistical distance measurement between decryption output and target language
Glyph-decode reveals: incremental plaintext exposure using hint budget system
Layered decipherment support: sequential application of multiple algorithms
Export functionality: text file generation of analysis data and plaintext results

Development Provenance

Avreno originated from academic cryptography coursework requirements for hands-on cipher manipulation. The design prioritizes complete offline operation with zero telemetry to maintain analytical privacy. Version 1.2 incorporates performance optimizations for frequency computation routines and interface refinements based on user testing with puzzle competition communities.

Core Capability Matrix

Statistical Engines

Integrated frequency analysis, IoC calculation, Kasiski examination, and chi-squared scoring provide quantitative validation for decryption hypotheses across all cipher types.

Alphabet Rail Interface

Physical manipulation metaphor for key adjustment with live decryption rendering. Haptic feedback pulses confirm optimal alignment based on plaintext likelihood metrics.

Case File System

Persistent storage of evidence photographs, transcription sessions, analysis parameters, and complete solution timelines. Export case data as structured text files.

Challenge Curriculum

Twenty-four curated ciphertext exercises spanning four difficulty tiers. Progressive complexity introduces polyalphabetic systems, layered encipherment, and custom alphabets.

OCR Transcription

Photograph handwritten cipher notes directly into workbench. Character recognition preprocessing reduces manual transcription time for field-collected materials.

Privacy Architecture

Complete on-device processing with zero network transmission. No account creation, no cloud synchronization, no usage analytics. All data remains exclusively local.