The key is generated from a user-supplied passphrase using an algorithm based on the SHA-256 hash function. The 7z format supports encryption with the AES algorithm with a 256-bit key. Similar executable pre-processing technology is included in other software the RAR compressor features displacement compression for 32-bit x86 executables and IA-64 executables, and the UPX runtime executable file compressor includes support for working with 16-bit values within DOS binary files. Delta encoding – delta filter, basic preprocessor for multimedia data.Near jump, near call, conditional near jump targets are split out and compressed separately in another stream. BCJ2 is an improvement on BCJ, adding additional x86 jump/call instruction processing. BCJ2– Pre-processor for 32-bit x86 executables. Normalise target addresses of near jumps and calls from relative distances to absolute destinations.
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