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I have an encrypted PDF document with permissions that allow me to fill in a form, but iText throws a BadPasswordException. Why The decryption process in iText isn t fine-grained. As soon as you start manipulating a document, iText will decrypt it, and this always requires the owner password. Note that if you ve created the PDF using iText, passing null as the password, you won t be able to change the document because you don t know the randomly created password.

Reader is an abstract base class for other readers in the API. Java uses a naming convention of Reader in the java.io package to denote classes that act as a bridge

Encrypting a PDF document using passwords isn t a waterproof solution. Password protection has to be seen as a psychological and legal barrier. If the document is encrypted, the author intends to protect the document against abuse. If you remove that protection without permission (that is, without the passwords), you re deliberately doing something you re not supposed to do. Extra restrictions were added to iText to prevent the use of the API for password removal. If you need better protection for your documents, you can use public-key encryption.

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between byte streams and character-based streams. The fundamental benefit of using a Reader is that character encoding is automatically translated from the byte representation of the data to the character representation of the data during the read operations. All other reader classes extend Reader. Since this class is abstract it cannot be 380

12.3.2 Public-key encryption With symmetric key algorithms, a single secret key has to be shared between the creator and the consumer of a document. The same key is used to encrypt and decrypt the content. Public-key cryptography uses asymmetric key algorithms, where the key used to encrypt a message is not the same as the key used to decrypt it. Each user has a pair of cryptographic keys: one that is kept secret the private key and one that is publicly distributed the public key. In the next example, you ll use a public key to encrypt a PDF document. This way, only the person who owns the corresponding private key will be able to open the document in Adobe Reader. But before you can do this, you need to find out how to create a public-private key pair.

used directly by applications. Applications requiring Reader capabilities should use InputStreamReader. InputStreamReader

You re developing in Java, so you can use the keytool application that comes with the JDK. Let s use the -genkey option to create a key store for somebody called Bruno Specimen:

$ keytool -genkey -alias foobar -keyalg RSA -keystore .keystore Enter keystore password: f00b4r What is your first and last name

InputStreamReader extends Reader and provides an implementation for read-

[Unknown]: Bruno Specimen What is the name of your organizational unit [Unknown]: ICT What is the name of your organization [Unknown]: Foobar Film Festival What is the name of your City or Locality [Unknown]: Foobar What is the name of your State or Province [Unknown]: What is the two-letter country code for this unit [Unknown]: BE Is CN=Bruno Specimen, OU=ICT, O=Foobar Film Festival, L=Foobar, ST=Unknown, C=BE correct [no]: yes Enter key password for <foobar> (RETURN if same as keystore password): f1lmf3st

Caution If you modify a base style, Word will update all styles you created from the base style. To avoid

ing character data from a byte stream, thus providing a layer of translation between byte and character data This class also provides capabilities for returning UTFencoded data InputStreamReader automatically supports buffering Each read operation will cause one or more bytes to actually be read from the stream, regardless of the data to be returned by the method 1343 When to use sockets Sockets are a primitive but lightweight method of connecting two systems and exchanging data Due to the low overhead of sockets, this can be one of the fastest methods of exchanging data and issuing commands between two systems However, the lightweight nature of sockets comes at the price of needing to define a protocol of how the two systems communicate In other words, sockets provide the connection, but the format of the information exchanged is something left to the implementer.

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