pslib is a C-library to create PostScript files on the fly. It offers many drawing primitives, inclusion of png and eps images and a very sophisticated text rendering including hyphenation, kerning and ligatures. It can read external Type1 fonts and embed them into the output file. It supports pdfmarks which makes it in combination with ghostscript's pdfwriter an alternative for libraries creating PDF
RC4 is fairly fast, secure and symmetric encryption algorithm. Developed by Ron Rivest in 1987 was kept trade secret until 9th September 1994 when it was posted on a Cypherpunks mailing list. Generally the key it uses is limited to 40 bits for various legal reasons but 128bits is the more common forms these days. To prove it's strength products like Oracle Secure SQL are examples. It's symmetric meaning it uses the same key and steps as to encrypt when decrypting.
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