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Hpmbcalc Hex Calculator
A programmable multiple-precision hex calculator with many utilities. With it, you can perform a lot of big number math and encryption operations, such as: square root, modular inverse; hash make; primality test; hex, dec, oct, bin conversions.

Advanced Encryption Package 2006 Professional
AEP2006 PRO's most noteworthy feature may be its flexibility and military grade encryption: program includes 17 encryption algorithms (Rijndael, TWOFISH, BLOWISH, CAST, MARS, TEA, etc) to encrypt your files. It also includes file shredder. RSA supp.

OpenSSL
Open SSL 0.9.7c lets applications use Secure Sockets Layer (v2/v3), Transport Layer Security (v1), and a general-purpose cryptography library, for data integrity, authenticity, and privacy security features. Perl or Cygwin needed for Win32 compile.

PowerKey
PowerKey is an advanced encryption toolkit with many unique features which you won't come across in other products of such a kind available online. It allows you to perform block encryption of files and folders, wipe and other.

Privacy For Windows
Award winning Privacy For Windows provides password protection for Windows 95 or 98, eliminating unauthorized access. The password is encoded for extra protection.This program miminizes to the system tray for quick loading.