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Encrypted SD fs driver #2

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opened 2023-08-21 07:31:28 +00:00 by tuxmain · 0 comments
tuxmain commented 2023-08-21 07:31:28 +00:00
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Find a way to encrypt files on SD card.

chacha20poly1305: stream cipher. Fastest but needs the file to be completely re-encrypted at each modification.
aes: block cipher.

Use bcrypt-pbkdf for key derivation. (hard-memory unusable with 32kB memory)
Use derived key to decrypt random-generated key stored in a file.

Idea:
Each encrypted file is divided into fixed-size blocks (e.g. 256B or 512B). Each block is encrypted using nonce=keyed_hash(key=key, preimage=file_uuid+block_number).

Find a way to encrypt files on SD card. chacha20poly1305: stream cipher. Fastest but needs the file to be completely re-encrypted at each modification. aes: block cipher. Use bcrypt-pbkdf for key derivation. (hard-memory unusable with 32kB memory) Use derived key to decrypt random-generated key stored in a file. Idea: Each encrypted file is divided into fixed-size blocks (e.g. 256B or 512B). Each block is encrypted using `nonce=keyed_hash(key=key, preimage=file_uuid+block_number)`.
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Reference: tuxmain/rustphone#2
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