ascii-zip

A deflate compressor that emits compressed data that is in the [A-Za-z0-9] ASCII byte range.

Example

$ echo 'Hello ASCII world!' >hello
$ ./compress.py --mode raw --output ./hello.infalted ./hello >/dev/null
$ cat ./hello.infalted
D0Up0IZUnnnnnnnnnnnnnnnnnnnUU5nnnnnn3SUUnUUUwCiudIbEAtwwwEt333
G0GDGGDtGptw0GwDDDGtDGDt33333www03333sDdFPsgWWwackSKKaowOWGQ4

Why?

It can be used for bypassing certain filters in certain applications :)

This algorithm is at the heart of the Rosetta Flash vulnerability. For additional information, see

• JSONP & handcrafted Flash files
• Handcrafting ASCII Flash Files for Fun and Profit
• Bypassing Same Origin Policy With JSONP APIs and Flash
• Abusing JSONP with Rosetta Flash.