DataTerminology.comNEW
A named combination of cryptographic algorithms negotiated by protocols like TLS to secure network connections.
DESCRIPTION
A cipher suite specifies the algorithms for key exchange, encryption, and message authentication in secure protocols like TLS. Examples include ECDHE for key exchange and AES-GCM or ChaCha20-Poly1305 for authenticated encryption. TLS 1.3 simplifies suites by fixing key exchange and separating signature algorithms from AEAD choices. Correct suite selection balances security, performance, and compatibility. Deprecated suites (e.g., those using RC4 or CBC without AEAD) should be disabled.
ALTERNATIVE DEFINITIONS
Cloudflare
A cipher suite is a set of algorithms that help secure a network connection that uses TLS/SSL.
Plain language definition emphasizing TLS/SSL context.
Wikipedia
A cipher suite is a named combination of cryptographic algorithms used to negotiate the security settings for a network connection using TLS or SSL.
Notes negotiation of security settings in TLS/SSL.
RELATED TERMS
TLS Secure Sockets Layer Key Exchange Authenticated Encryption AES-GCM ChaCha20-Poly1305 ECDHE RSA Hash Function Protocol Negotiation
COMPETING TERMS
IPsec Transform Set
KNOWLEDGE AREAS
TARGET AUDIENCE
Security Architect Cybersecurity Engineer Chief Information Security Officer Cloud Architect Software Developer
EXTERNAL SOURCES
- Wikipedia - Cipher suite
- RFC 8446 (TLS 1.3) - TLS 1.3 cipher suites
- Mozilla - Recommended TLS configurations
- NIST - TLS configuration guidance
TOP QUESTIONS
What components make up a Cipher Suite?
Key exchange, bulk encryption (often AEAD), and hashing for integrity; TLS 1.3 focuses on AEAD and prf/hash, with separate signature algorithms.
Category: Definition
Why disable deprecated Cipher Suites?
Old suites may use weak algorithms like RC4 or non-AEAD CBC modes, exposing connections to known attacks.
Category: Risks
How are Cipher Suites negotiated?
Clients advertise supported suites; servers select a mutually supported one during the TLS handshake.
Category: Process
What is a secure modern Cipher Suite?
TLS_AES_128_GCM_SHA256 and TLS_CHACHA20_POLY1305_SHA256 are typical secure choices in TLS 1.3.
Category: Example
How do Cipher Suites impact performance?
Algorithm choice affects CPU and hardware acceleration. ChaCha20-Poly1305 can outperform AES-GCM on devices without AES-NI.
Category: Performance
Are Cipher Suites the same in TLS 1.2 and 1.3?
No. TLS 1.3 simplifies and changes semantics, removing many legacy combinations.
Category: Comparison
Who governs Cipher Suite standards?
IETF defines TLS specifications; NIST provides configuration guidance for federal systems.
Category: Governance
How do I audit Cipher Suites on a server?
Use tools like SSL Labs, nmap scripts, or OpenSSL s_client to enumerate and test suites.
Category: Tools
What’s a common misconfiguration with Cipher Suites?
Leaving weak fallback suites enabled for compatibility, which undermines overall security.
Category: Mistakes