Documentation

This tool performs local encryption/decryption for RC2, RC4, RC5, and RC6 with algorithm-specific parameters, modes, and encoding formats.

RC2 and RC4 have known weaknesses, and RC4 has been deprecated from TLS/SSL. RC5 and RC6 are relatively safer, but modern production systems should still prefer algorithms such as AES-256.

Key Features

  • RC2 / RC4 / RC5 / RC6 support
  • Configurable modes, paddings, rounds, and per-algorithm options
  • Multiple input/output encodings
  • Key, IV, and parameter validation hints

Steps

  1. Select algorithm and encrypt/decrypt mode.
  2. Configure mode, padding, and algorithm-specific options.
  3. Enter key, IV, and text input.
  4. Run and copy output.

Notes

  • RC2/RC4 are not recommended for strong modern security requirements.
  • Be aware of known RC4 biases and deprecation status.
  • Prefer modern standards (such as AES or ChaCha20) in production.