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MyTopSecret-Data

Encrypts data with emphasis on storage space.

Binary layout

|0,1|2,3,4|5,6,7|8........n|

[0; 1] - CRC16 of [2; n]
[2; 4] - Is payload compressed (1 bit), Time in hours since epoch (23 bit)
[5; 7] - Random bytes
[8; n] - AES encrypted data

Use cases

  • Printing in Hex format or as a 2D barcode:
    • physical backup for important passwords

Quick guide

Create file with content:

url: github
email: [email protected]
password: 12345678
---
url: discord
email: [email protected]
password: 87654321

Encrypt

mtsd -e plaintext.mtsd -o encrypted.bin

Decrypt

mtsd encrypted.bin

Encryption

pwd = from_user_input()
salt = derive_salt_from([time_now, random_bytes])
key, nonce = Argon2id(iter=3,mem=64MB,parallel=2)
encrypted = AES256_CTR(data, key, nonce)

Compatibility

Backward compatibility is not supported in the current implementation. Any changes to Argon2 complexity or LZMA parameters will break the ability to decrypt old data.
This project was created for personal use.

Comparison with password managers