1 Click Encrypt File Folder Encryption 

1 Click Encrypt is the encryption utility that brings military strength encryption power at your fingertips, assuring that your files are secured and protected from intruders and spies. It can encrypt or securely hide any type of file.
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Advanced File Protector 

Advanced File Protector is a professional file encryption tool. It uses very the strongest encryption encryption algorithms available, including RSA and the newest AES standard Rijndael to make sure your private data remains confidential.
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Encryption Workshop 

Currently nine strong symmetrical block ciphers are implemented: BLOWFISH, GOST, RC 4, DES, Skipjack, TWOFISH, TEA and XOR. Any type of file can be encrypted/decrypted, not only ZIP files.
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Private Encryptor 

The latest in encryption technology to protect your sensitive data. Privacy tools include file/folder encryption, e-mail encryption, file shredder, file Backup with auto encryption, My Passwords, My Private Notes, Self Decrypting Executables.
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cryptlib 

Security toolkit with strong encryption and authentication. Supports many algorithms for symmetric/asymmetric encryption, authentication, and hashing. Free for non-commercial/shareware projects. Written in C. ActiveX and C++ wrappers are available.
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axsStrongBox 

axsStrongBox is a COM component which provides secure data encryption (public and private key) using industry standard, strong algorithms. It also provides digital signatures, hashing, GZIP and Base64 capability.
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