Technical articles and historical engineering writing on software and systems engineering, real-time data processing, artificial intelligence, speech and signal processing, digital forensics, cybersecurity and algorithms.
The Blog contains my technical articles on software and systems engineering, artificial intelligence, digital forensics, cybersecurity, and the history of technology.
Local and global image descriptors, similarity metrics, dimensionality reduction and matching strategies for large visual collections.
The image pipeline from sensor readout to codecs and containers, including the latency, bandwidth and quality trade-offs of live transmission.
SQL injection occurs when untrusted input becomes executable SQL syntax instead of remaining a bound data value.
-ffast-math changes floating-point assumptions around reassociation, NaN, infinity and signed zero; it is a numerical contract, not only a speed flag.
MFCC reduces a short-time speech spectrum to a compact coefficient vector through Mel scaling, logarithmic energy, and the DCT; framing and filter-bank choices directly affect feature stability.
Production VAD is more than an energy threshold; PCM framing, noise modeling, decision smoothing, channel ownership, and the segment state machine jointly determine latency and accuracy.
An engineering view of digital image and audio processing, from sensing and sampling to feature extraction, learned models and real-time constraints.
File carving recovers candidate files without filesystem metadata by combining signatures with structural validation; header matching alone produces weak boundaries and false positives.
PKCS #7 and CMS define interoperable structures for signed, encrypted, digested and certificate-related content; security depends on algorithms, certificate validation, parsing limits and protocol policy.
In a fixed-memory AES-128 implementation, state layout, key-expansion order, and final-round behavior determine correctness; passing test vectors does not provide side-channel resistance.
A historical and technical examination of the RED Type A diplomatic cipher machine, its 6/20 letter split, mechanism, British and American cryptanalysis, relationship with PURPLE, and intelligence value.
Java processing of telephony WAV files must distinguish the WAV container from its codec, correctly decode A-law, mu-law, or PCM, and only then prepare audio for VAD or ASR.
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