RC4 Legacy Compatibility Reference

Reference-only guidance for identifying and retiring RC4 dependencies. Runtime encryption and decryption are disabled.

Use RC4 only to reproduce or inspect legacy formats.
RC4 Legacy Compatibility Reference: Paste non-sensitive sample data first; do not paste secrets, tokens, customer data, or production keys.
RC4 Legacy Compatibility Reference: For new security-sensitive work, use a reviewed modern cryptographic design outside this compatibility helper.

RC4 is a migration target, not a design option

Runtime execution is disabled. RC4 has known statistical weaknesses, and RC4 cipher suites are prohibited in TLS. Preserve only enough non-sensitive information to identify the legacy dependency and replace it.

Record the library, key material source, drop/discard behavior, and ciphertext encoding.
Do not generate new RC4 test data when an existing fixture can be used.
Replace transport use with a currently supported TLS configuration and application data with an authenticated cipher.

Standards reference

See RFC 7465: Prohibiting RC4 Cipher Suites.

Usage boundaries and result checks

RC4 Legacy Compatibility Reference is for this task: Reference-only guidance for identifying and retiring RC4 dependencies; runtime execution is disabled. It runs in the browser; start with a short, non-sensitive sample and confirm the behavior before processing more data.

Best use

Use it for a focused RC4 Legacy Compatibility Reference task when a quick browser workbench is appropriate.

Input

text, an encoded string, or the data format named by the tool

Output

an encoded, decoded, or compatibility-check result

Before reuse

For RC4 Legacy Compatibility Reference: Confirm the character set, byte boundary, and target protocol. Encoding is not encryption. See the test method.