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2. QPDF - Wikipedia

   en.wikipedia.org/wiki/QPDF

   QPDF is a software library and a free command-line program that can convert one PDF file to another equivalent PDF file. It is capable of performing transformations such as linearization (also known as web optimization or fast web viewing), encryption, and decryption of PDF files. [2]

3. List of PDF software - Wikipedia

   en.wikipedia.org/wiki/List_of_PDF_software

   Default PDF and file viewer for GNOME; replaces GPdf. Supports addition and removal (since v3.14), of basic text note annotations. CUPS: Apache License 2.0: No No No Yes Printing system can render any document to a PDF file, thus any Linux program with print capability can produce PDF files Pdftk: GPLv2: No Yes Yes

4. Cryptanalysis - Wikipedia

   en.wikipedia.org/wiki/Cryptanalysis

   To decrypt the ciphertext, the recipient requires a secret knowledge from the sender, usually a string of letters, numbers, or bits, called a cryptographic key. The concept is that even if an unauthorized person gets access to the ciphertext during transmission, without the secret key they cannot convert it back to plaintext.

5. OpenKeychain - Wikipedia

   en.wikipedia.org/wiki/OpenKeychain

   OpenKeychain is a free and open-source mobile app for the Android operating system that provides strong, user-based encryption which is compatible with the OpenPGP standard. This allows users to encrypt, decrypt, sign, and verify signatures for text, emails, and files. The app allows the user to store the public keys of other users with whom ...

6. KGPG - Wikipedia

   en.wikipedia.org/wiki/KGPG

   KGpg is a graphical frontend to GnuPG for KDE, which includes a key management window and an editor. Users can easily create cryptographic keys, and write, encrypt, decrypt, sign, or verify messages. Through integration with the Konqueror browser/file manager, users can easily encrypt files by right-clicking and choosing Actions > Encrypt File ...

7. List of x86 cryptographic instructions - Wikipedia

   en.wikipedia.org/wiki/List_of_x86_cryptographic...

   Encrypt/Decrypt data, using the AES cipher in various block modes (ECB, CBC, CFB, OFB and CTR, respectively). rCX contains the number of 16-byte blocks to encrypt/decrypt, rBX contains a pointer to an encryption key, ES:rAX a pointer to an initialization vector for block modes that need it, and ES:rDX a pointer to a control word.