Çok Aşamalı Dijital Belge İş Akışlarında Klasik Steganografi Yöntemlerinin Karşılaştırmalı Dayanıklılık Analizi

Öz

Bu çalışmada klasik görüntü steganografi yöntemlerinin dijital belge iş akışları altındaki dayanıklılığı sistematik olarak analiz edilmiştir. LSB, DCT ve DWT tabanlı gömme yöntemleri; JPEG sıkıştırma, PDF rasterizasyonu ve yeniden boyutlandırma gibi çok aşamalı dönüşümler altında değerlendirilmiştir. Deneyler Microsoft COCO veri setinden seçilen 100 görüntü üzerinde gerçekleştirilmiştir. Her görüntüye hata düzeltme kodu ile desteklenen sabit uzunlukta mesaj gömülmüş ve dönüşüm sonrası Bit Error Rate (BER), ECC başarı oranı ve Perfect Recovery Rate (PRR) metrikleri hesaplanmıştır. Sonuçlar, yüksek PSNR ve SSIM değerlerinin her zaman başarılı mesaj geri kazanımı anlamına gelmediğini göstermektedir. LSB yöntemi tüm kalite seviyelerinde başarısız olurken, DCT yöntemi yüksek kalite faktöründe başarılı ancak orta seviyede ani performans kaybı göstermiştir. DWT yöntemi ise kademeli bozulma karakteristiği sergileyerek daha kararlı sonuçlar üretmiştir. Bulgular, klasik yöntemlerin modern belge üretim zincirleri altında farklı davranış sergilediğini ortaya koymaktadır.

Anahtar Kelimeler

• Steganografi
• Dijital belge iş akışı
• JPEG sıkıştırma
• Dalgacık dönüşümü
• Sağlamlık analizi

Comparative Durability Analysis of Classical Steganography Methods in Multi-Stage Digital Document Workflows

Öz

This study presents a systematic robustness analysis of classical image steganography methods under multi-stage digital document workflows. LSB, DCT, and DWT-based embedding approaches were evaluated under JPEG compression, PDF rasterization, and resizing scenarios. Experiments were conducted on 100 images selected from the Microsoft COCO dataset. A fixed-length message supported by error correction coding was embedded into each image, and post-transformation performance was assessed using Bit Error Rate (BER), ECC success rate, and Perfect Recovery Rate (PRR). Results reveal that high visual quality metrics such as PSNR and SSIM do not necessarily guarantee successful message recovery. The LSB method failed under all compression levels, while the DCT method exhibited a sharp threshold behavior, succeeding only at high-quality factors. In contrast, the DWT-based approach demonstrated gradual degradation characteristics and maintained higher recovery stability at practical compression levels. The findings highlight that classical steganographic techniques behave differently within modern document production chains and emphasize the importance of channel-aware robustness evaluation.

Anahtar Kelimeler

• Steganography
• Digital document workflow
• JPEG compression
• Wavelet transform
• Robustness analysis

Kaynakça

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