带有方框的 PDF，可使用数字证书对其进行签名

Question

下午好，我正在实习，我需要一个带有盒子的pdf，以便用数字证书对其进行签名，但我在任何地方都找不到它。如果有人有证据的话。 非常感谢

Answer 1

PDF 签名没有什么特别的。与纸上的其他文本或图像签名相比，它只是一个盒子，因此您可以在记事本中编写工作副本。 关键是应用签名是用于纸质打印输出的 Adobe 数字设计功能。所以这里的文本是通过 Adobe Acrobat Reader 读取的，签名是通过 Adobe 签名盖章的。

这里的代码为text.pdf

%PDF-1.0
1 0 obj<</AcroForm 2 0 R/Pages 3 0 R/Type/Catalog>>endobj
2 0 obj<</DR<</Font<</Helv 4 0 R>>>>/Fields[5 0 R]>>endobj
3 0 obj<</Count 1/Kids[6 0 R]/Type/Pages>>endobj
4 0 obj<</BaseFont/Helvetica/Encoding 7 0 R/Subtype/Type1/Type/Font>>endobj
5 0 obj<</AP<</N 8 0 R>>/DA(0 g /Helv 0 Tf)/F 4/FT/Sig/P 6 0 R/Rect[220 680 370 730]/Subtype/Widget/T(Signature1)/Type/Annot>>endobj
6 0 obj<</Annots[5 0 R]/Contents 9 0 R/Parent 3 0 R/Resources<</Font<</0<</BaseFont/Symbol/Subtype/Type1/Type/Font>>/1<</BaseFont/Arial/Subtype/Type1/Type/Font>>>>>>/Type/Page>>endobj
7 0 obj<</Type/Encoding/Differences[24/breve/caron/circumflex/dotaccent/hungarumlaut/ogonek/ring/tilde 39/quotesingle 96/grave 128/bullet/dagger/daggerdbl/ellipsis/emdash/endash/florin/fraction/guilsinglleft/guilsinglright/minus/perthousand/quotedblbase/quotedblleft/quotedblright/quoteleft/quoteright/quotesinglbase/trademark/fi/fl/Lslash/OE/Scaron/Ydieresis/Zcaron/dotlessi/lslash/oe/scaron/zcaron 160/Euro 164/currency 166/brokenbar 168/dieresis/copyright/ordfeminine 172/logicalnot/.notdef/registered/macron/degree/plusminus/twosuperior/threesuperior/acute/mu 183/periodcentered/cedilla/onesuperior/ordmasculine 188/onequarter/onehalf/threequarters 192/Agrave/Aacute/Acircumflex/Atilde/Adieresis/Aring/AE/Ccedilla/Egrave/Eacute/Ecircumflex/Edieresis/Igrave/Iacute/Icircumflex/Idieresis/Eth/Ntilde/Ograve/Oacute/Ocircumflex/Otilde/Odieresis/multiply/Oslash/Ugrave/Uacute/Ucircumflex/Udieresis/Yacute/Thorn/germandbls/agrave/aacute/acircumflex/atilde/adieresis/aring/ae/ccedilla/egrave/eacute/ecircumflex/edieresis/igrave/iacute/icircumflex/idieresis/eth/ntilde/ograve/oacute/ocircumflex/otilde/odieresis/divide/oslash/ugrave/uacute/ucircumflex/udieresis/yacute/thorn/ydieresis]>>endobj
8 0 obj<</BBox[0 0 150 50]/Length 0/Resources<<>>/Subtype/Form/Type/XObject>>stream
endstream
endobj
9 0 obj<</Length 597>>stream
BT 15 800 Td 40 TL /1 18 Tf
(PlainText = http://foersom.com/net/HowTo/data/OoPdfFormExample.pdf)'
/1 16 Tf 40 TL (12  letters.)' 20 TL
(9)' 27 20 Td (letters.)'
-27 0 Td(A)' 25 20 Td(a)' 17 20 Td(a)' 18 20 Td(a)' 23 20 Td(a)' -72 20 Td(b)' 58 20 Td(b)' -35 20 Td(c)' 17 20 Td(d)' 26.5 20 Td(r)' -58 20 Td(r)'
40 TL
(goto page in another PDF)' 20 TL
(Also plain text = https://pdfobject.com/pdf/sample-3pp.pdf#page=2)' 25 TL/1 11 Tf
120 140 Td(Sign and Secure this file.txt as a PDF with Adobe Reader)'
-5 -40 Td(or click https://www.adobe.com/acrobat/online/sign-pdf.html)'
ET
220 680 150 50 re
S
endstream
endobj
xref
0 10
0000000000 65536 f 
0000000009 00000 n 
0000000067 00000 n 
0000000126 00000 n 
0000000175 00000 n 
0000000251 00000 n 
0000000384 00000 n 
0000000568 00000 n 
0000001757 00000 n 
0000001858 00000 n 
trailer
<</Size 10/Root 1 0 R>>
startxref
2501
%%EOF

注意由于剪切和粘贴，这些尾随数字将是错误的

无论是像chrome这样无法显示标志的pdf查看器还是显示标志的阅读器，但出于安全原因不会对文件进行签名，它们都可以使用超文本链接进行adobe签名。