CompressEncrypt

Encryption and Compression Scripts

This project contains two scripts: CompressEncrypt.nim and DecryptDecompress.py. These scripts demonstrate how to compress and encrypt data, and then decrypt and decompress it.

CompressEncrypt.nim

This Nim script performs the following tasks:

1. Converts a string to a byte sequence.
2. Compresses the byte sequence using Zstandard (zstd) compression.
3. Encrypts the compressed data using AES-256 in CTR mode.
4. Outputs the encrypted data, the key, and the IV in base64 encoding.

Key Components:

• Compression: Uses the zstd/compress module to compress the data.
• Encryption: Uses the nimcrypto library to perform AES-256 encryption in CTR mode.
• Key Derivation: Uses SHA-256 to derive a 32-byte key from a given string.

DecryptDecompress.py

This Python script performs the following tasks:

1. Decodes the base64-encoded ciphertext, key, and IV.
2. Decrypts the ciphertext using AES-256 in CTR mode.
3. Decompresses the decrypted data using Zstandard (zstd) decompression.
4. Prints the decompressed data.

Key Components:

• Decryption: Uses the pycryptodome library to perform AES-256 decryption in CTR mode.
• Decompression: Uses the zstandard library to decompress the data.

Usage

1. Run CompressEncrypt.nim to compress and encrypt your data. The script will output the encrypted data, key, and IV.
2. Use the output from the Nim script as input for DecryptDecompress.py to decrypt and decompress the data.

Ensure you have the necessary dependencies installed for both scripts:

• Nim dependencies: nimcrypto, zstd
• Python dependencies: pycryptodome, zstandard

Credits

• https://github.com/wltsmrz/nim_zstd
• https://github.com/byt3bl33d3r/OffensiveNim/blob/master/src/encrypt_decrypt_bin.nim
• https://github.com/indygreg/python-zstandard