RC4 Decryption

Decrypt RC4 encrypted text using the secret key. RC4 stream cipher - simple and fast encryption.

Secret Key
Enter your decryption key
Encrypted Text
Paste encrypted text to decrypt
Decrypted Text
Original plaintext

What is RC4 Decryption?

RC4 decryption reverses the encryption process, converting ciphertext back to plaintext using the secret key.

Key Features

  • Symmetric Decryption: Same key used for both encryption and decryption
  • Secure: Only correct key can decrypt the data
  • Exact Match: Produces original plaintext when correct key is used
  • Error Detection: Wrong key produces garbage or error

How It Works

  1. Ciphertext + Secret Key → Decryption → Plaintext

You must use the exact same key that was used for encryption.

Common Use Cases

  • Data Recovery: Decrypt protected files and documents
  • Secure Communication: Read encrypted messages
  • Database Access: Decrypt sensitive database fields
  • File Access: Open encrypted files
  • API Response: Decrypt API response payloads

Important Notes

  • Key Must Match: Decryption key must exactly match encryption key
  • Keep Keys Safe: Lost keys mean lost data
  • Wrong Key: Using wrong key will produce garbage or error
  • Case Sensitive: Keys are case-sensitive

Example

Encrypted Text: Random-looking ciphertext Secret Key: my-secret-key Decrypted: Original plaintext message