EGG Format
ALZip's next-generation format — supports 5 encryption modes and solid compression
History
EGG is the successor to ALZ, released by ESTSoft in 2008 and used as the default format starting with ALZip 8.0. It was designed to overcome ALZ's limitations (low compression, weak encryption) by combining multiple algorithms with Korean national encryption standards.
Key Features
- Mixed algorithms — BWT, LZMA, BZip2 and others, applied based on file characteristics
- Solid compression — Like 7Z, bundles files for higher compression
- 5 encryption modes — AES-128/256, ARIA-128/256, and SEED (Korean national standards)
- Split archives — .vol1.egg, .vol2.egg, … format
- Unicode filenames — Native UTF-8 support for safe multilingual filenames
- Integrity check — CRC32 checksums detect corruption
Strengths
Few tools support EGG with Korean national encryption (SEED, ARIA), but KingZip handles split and encrypted EGG automatically. Higher compression than ALZ.
KingZip Support
KingZip handles all 5 EGG encryption modes automatically and supports both split and solid-compressed EGG. SEED and ARIA encrypted EGG files extract without issue.