Structured Analysis and Comparison of Alphabets in Historical Handwritten Ciphers

• URL: http://arxiv.org/abs/2410.21913v1
• Date: Tue, 29 Oct 2024 10:12:16 GMT
• Title: Structured Analysis and Comparison of Alphabets in Historical Handwritten Ciphers
• Authors: Martín Méndez, Pau Torras, Adrià Molina, Jialuo Chen, Oriol Ramos-Terrades, Alicia Fornés,
• Abstract summary: We propose the CSI metric, a novel way of comparing pairs of ciphered documents. We assess their effectiveness in an unsupervised clustering scenario utilising visual features, including SIFT, pre-trained learnt embeddings, and OCR descriptors.
• Score: 3.423211639513232
• License:
• Abstract: Historical ciphered manuscripts are documents that were typically used in sensitive communications within military and diplomatic contexts or among members of secret societies. These secret messages were concealed by inventing a method of writing employing symbols from diverse sources such as digits, alchemy signs and Latin or Greek characters. When studying a new, unseen cipher, the automatic search and grouping of ciphers with a similar alphabet can aid the scholar in its transcription and cryptanalysis because it indicates a probability that the underlying cipher is similar. In this study, we address this need by proposing the CSI metric, a novel way of comparing pairs of ciphered documents. We assess their effectiveness in an unsupervised clustering scenario utilising visual features, including SIFT, pre-trained learnt embeddings, and OCR descriptors.

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