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TLS Cipher Checker

Look up any TLS cipher suite name — TLS_AES_256_GCM_SHA384, TLS_RSA_WITH_RC4_128_SHA — and get its strength rating from Strong to Insecure, with the reason in plain words. Code never leaves your device — formatting and validation run locally in your browser.

100% Local Browser Native

How to Use the TLS Cipher Checker

1. Paste the cipher name

Exactly as the server or scan reported it, e.g. TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA. Try a preset to feel the scale.

2. Read the strength rating

Strong/Good/Moderate/Weak/Deprecated/Insecure plus the mechanism note — PFS, key size, known attacks.

3. Decide what to disable

Anything Weak or worse goes off the server config; re-test the live host afterwards.

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Frequently Asked Questions

Which ciphers rate Strong?

TLS 1.3 suites (AES-GCM, ChaCha20) and ECDHE suites with 256-bit keys and AEAD. Perfect forward secrecy plus modern AEAD is the bar — anything without PFS caps at Moderate.

Why is CBC marked Weak?

CBC-mode suites in TLS 1.2 and below fall to padding-oracle attacks (Lucky 13 family). The mode, not just the key length, decides the rating.

Does this scan my server?

No — this is a name lookup against a reference table, fully local. To test a live host, use the SSL/TLS Checker with its hostname instead.

What if my cipher is not listed?

Unknown names return an explicit Unknown verdict with a pointer to the IANA TLS registry — never a guessed rating. Proprietary or brand-new suites land here first.

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Last updated October 2026