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The PDF/A specification is also known as ISO 19005-1:2005: Document Management Electronic Document File Format for Long-Term Preservation Part 1: Use of PDF 1.4 (PDF/A-1). The standard was approved in September 2005. The initiative for PDF/A was started by the Association for Information and Image Management (AIIM) and the Association for Suppliers of Printing, Publishing, and Converting Technology (NPES). There are many electronic formats and technologies to choose from for archiving electronic data. The proprietary nature of many of these formats is one of the biggest disadvantages. There s no guarantee that a Word document created with the latest Microsoft Word version will open up in the newest version ten years from now. And even if you re able to open it, you can t expect it to look like it looked in the version of Word that was used to create it. As opposed to most word-processing formats, PDF represents not only the data contained in the document, but also the exact form the document takes. The file can be viewed without the originating application. Adobe also made sure that all the revisions of the PDF specification are backward compatible, so no matter the version number, the PDF will always look the same even on newer PDF viewers. Even before PDF was published as an ISO standard, the PDF version of the specification was available for free. Anyone, at any time, using any hardware or software, can create programs to access PDF documents. This makes PDF (ISO-32000) an interesting candidate as a format for archiving. PDF/A goes a step further. It s a subset of PDF-1.4, and like PDF/X, PDF/A imposes requirements and constraints.

require 'digest/sha1' puts Digest::SHA1.hexdigest('test' * 1000)

In order to meet level-B conformance, all fonts must be embedded, encryption isn t allowed, audio and video content are forbidden, JavaScript and executable file launches are not permitted, and so forth. Each PDF/A document must contain metadata in the form of an XMP stream. Here is how to create a level-B PDF/A document using iText.

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Digest::SHA1 operates using the SHA-1 hashing algorithm, currently known and used as a reasonably secure hashing operation. It results in a 160-bit output (as with the 20 hexadecimal numbers from hexdigest), meaning there are some 1,461,501,637,330, 902,918,203,684,832,716,283,019,655,932,542,976 possible hash values. This almost guarantees there will be no clashing hash values for legitimate data within a single domain. Another hashing mechanism provided by Ruby is based on the MD5 hashing algorithm. MD5 produces a 128-bit hash value, giving 340,282,366,920,938,463,463,374,607, 431,768,211,456 combinations. MD5 is considered to be less secure than SHA-1, as it s possible to generate hash collisions, where two sets of valid data can be engineered to get the same hash value. Hash collisions can be used to break into authentication systems that rely on MD5 hashing. However, MD5 is still a popular hashing mechanism, so the Ruby support is useful. You can use Digest::MD5 in exactly the same way as SHA-1: require 'digest/md5' puts Digest::MD5.hexdigest('test' * 1000)

Document document = new Document(); PdfWriter writer = PdfWriter.getInstance(document, new FileOutputStream(filename));

Using digests in place of passwords is easily done:

Use cases describe how external entities will use the system. These external entities can be either humans or other systems and are referred to as actors in UML terminology. The description emphasizes the users view of the system and the interaction between the users and the system. Use cases help to further define system scope and boundaries. They are usually in the form of a diagram, along with a textual description of the interaction taking place. Figure 2-1 shows a generic diagram that consists of two actors represented by stick figures, the system represented by a rectangle, and use cases depicted by ovals inside the system boundaries.

Sets conformance writer.setPdfVersion(PdfWriter.PDF_VERSION_1_4); to PDF/A level B writer.setPDFXConformance(PdfWriter.PDFA1B); writer.createXmpMetadata(); Creates XMP document.open(); metadata Font font = FontFactory.getFont( Embeds FONT, BaseFont.CP1252, BaseFont.EMBEDDED); fonts document.add(new Paragraph("Hello World", font)); ICC_Profile icc = ICC_Profile.getInstance(new FileInputStream(PROFILE)); Sets output writer.setOutputIntents("Custom", "", intents "http://www.color.org", "sRGB IEC61966-2.1", icc); document.close();

require 'digest/sha1' puts "Enter the password to use this program:" password = gets if Digest::SHA1.hexdigest(password) == '24b63c0840ec7e58e5ab50d0d4ca243d1729eb65' puts "You've passed!" else puts "Wrong!" exit end

In this case, the password is stored as an SHA-1 hex digest, and you hash any incoming passwords to establish if they re equal. Yet without knowing what the password is, there s no way you could succeed with the preceding program even by looking at the source code!

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