This is the most fundamental form of verification. A cryptographic hash function (like SHA-256) creates a unique, fixed-size "digital fingerprint" of a file. If any character within the PDF is changed, even the smallest alteration, the hash value will completely change. Python's hashlib library makes this trivially easy.
from reportlab.pdfgen import canvas from reportlab.pdfbase import pdfmetrics from reportlab.pdfbase.ttfonts import TTFont python khmer pdf verified
The first major hurdle in building a "verified" system is the Khmer script itself. Unlike Latin-based alphabets, Khmer is a complex Unicode script with unique text-shaping rules. The standard approach of just reading a PDF file often results in garbled, out-of-order, or completely missing characters. This is because PDF generators have historically struggled with complex scripts, and some older methods treat characters as individual glyphs without considering their correct positioning for Khmer. This is the most fundamental form of verification