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@@ -1,2 +1,22 @@
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-# volatilefs
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+# butterflyfs
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+This project allow creating butterflyfs partition type and mount them.
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+The butterflyfs partition type is a volatile partition type, but stored in a physical device or file.
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+
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+To ensure the ephemeral state of the filesystem, the inode and data will be encrypted using a simple rot-X with a key generated by random with a random size at mount-time and dropped at unmount-time.
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+
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+To avoid reversing the key, the firsts N (randomly chosen) bytes before the first inode will be filled with random bytes.
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+
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+### Filesystem Definition
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+
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+The partition will look like this:
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+- Fixed-length filesystem meta definition
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+- N random bytes (length to be determined at mount-time)
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+- Fixed-length first inode Definition
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+- Data and inodes
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+
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+### File system's meta Definition
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+
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+### Inode definition
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+
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+### Data definition
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