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Playfair密码是一种有向图替换密码。

Malbolge language interpreter online ( JavaScript ). Malbolge, invented by Ben Olmstead in 1998, is an esoteric programming language designed to be as difficult to program in as possible.

Online Domain Tools

GeocachingToolbox.com. All geocaching tools a geocacher needs in one box: a lot useful geocaching tools, links, html tips and more.

quipqiup - cryptoquip and cryptogram solver

Western Michigan University | A top 100 national university