MiscCrypto

Under Windows

CryptTool

• Demonstration and Reference Program for Cryptography + making AES executables
• freeware

AxCrypt

• AES-128 File Encryption, Compression and double-click Edit/View for secure document storage on Windows 95/98/ME/NT/2K/XP, locally or remote.
• GPL

Zip 2 Secure EXE

• AES-128/192/256 bits File Encryption, Create self-extracting EXE files from zip files
• freeware

Misc

To unlock password-protected pdfs

• PDF documents may have up to 2 passwords:
  • User password: protects read access to the document, and when no Owner password is specified, also protects permission settings.
  • Owner password: protects full access to the document, and protects permission settings (printing, copying...)

• Use pdftops to remove password from a protected PDF. It works with either password, but when both passwords are set, it also works when only the user password is known (upon condition that permission allow Printing is set).

apt-get install gs-common xpdf-utils
pdftops -upw <password> <encrypted>.pdf <decrypted>.ps              # To generate a PostScript file (e.g. for further editing)
pdftops -upw <password> <encrypted>.pdf -|ps2pdf - <decrypted>.pdf  # To generate a new PDF
pdftops -opw <password> <encrypted>.pdf -|ps2pdf - <decrypted>.pdf  # When the Owner Password is known...

• An other solution is to use PDF Toolkit pdftk (apt-get install pdftk). However unlike pdftops this method doesn't work when only user password is known but both passwords are set.

pdftk <encrypted>.pdf input_pw <password> output <decrypted>.pdf

• pdftk can also be used to generate protected documents, and specifying permissions.

pdftk <unprotected>.pdf output <protected>.pdf allow Printing owner_pw <ownerpwd> user_pw <userpwd>    #Allow HQ printing

pwsafe

To use 'secure ram' (thereby locking the data in memory and preventing it being flushed to disk) you may like to run it setuid root:

$ sudo dpkg-statoverride --update --add --force root root 4755 /usr/bin/pwsafe