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Format Conversion
Encrypt and decrypt text using RC4 stream cipher with a key
Execution
Fill in the form, run the tool, and review the result in one place.
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Tool usage guide
The RC4 Stream Cipher tool provides a straightforward way to encrypt and decrypt text using the RC4 algorithm. By entering your source text and a secret key, you can quickly transform sensitive information into ciphertext or revert encrypted strings back to their original readable format.
Background
A developer needs to hide a simple internal API endpoint string within a legacy configuration file.
Problem
The string is plain text and visible to anyone with file access.
How to use
Paste the endpoint URL into the input, enter a secure passphrase in the key field, and select 'Encrypt'.
Operation: EncryptOutcome
The tool outputs an obfuscated string that can be safely stored in the configuration file.
Background
An administrator found an old log file containing encrypted entries from a deprecated system.
Problem
The data is unreadable and needs to be recovered for an audit.
How to use
Paste the encrypted log entry into the input, enter the known legacy key, and select 'Decrypt'.
Operation: DecryptRC4 is a stream cipher that encrypts data byte-by-byte using a variable-length key.
No, RC4 is considered cryptographically broken and is not recommended for securing sensitive modern communications.
Yes, you must use the exact same key that was used during the encryption process to successfully decrypt the text.
This tool is designed specifically for text input; it does not support direct file uploads or binary file encryption.
No, all encryption and decryption operations are performed locally in your browser for your privacy.
Outcome
The tool returns the original, readable log entry, allowing the administrator to complete the audit.