Ciphersuite Info (2024)

FAQs

Why is TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 considered weak? ›

TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 and TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 may show up as weak when you performed an SSL report test. This is due to known attacks toward OpenSSL implementation. Dataverse uses Windows implementation that is not based on OpenSSL and therefore is not vulnerable.

Any CBC cipher suite will be marked as "weak" due to the difficulty of implementing CBC without error. In these modern times, there are better options, however, you may want some CBC ciphers as a fallback for older clients. Note, weak does not mean vulnerable.

Weak TLS_RSA_WITH_AES_256_GCM_SHA384

This key exchange algorithm does not support Perfect Forward Secrecy (PFS) which is recommended, so attackers cannot decrypt the complete communication stream.

AES based ciphers are more secure than the corresponding 3DES, DES, and RC4 based ciphers. AES-GCM ciphers are more secure than AES-CBC ciphers.

To remediate weak cipher usage, modify the msDS-SupportedEncryptionTypes AD attribute on the applicable devices and accounts, and remove the weak ciphers based on these bit flags.

Find the cipher using Chrome

Select More tools > Developer tools > Security. Look for the line "Connection...". This will describe the version of TLS or SSL used.

Current Status. Many organisations such as Qualys SSL Labs, Microsoft etc consider CBC ciphers to be weak and discourage their use. Major browsers have deprecated or disabled support for vulnerable CBC ciphers. CBC ciphers should be avoided and instead use GCM where possible.

What is the hardest cipher code? ›

AES ‍ One of the hardest codes to crack is arguably the US government's Advanced Encryption Standard (aka Rijndael or AES) which the Americans use to protect top-secret information. AES is considered unbreakable by even the most sophisticated hackers.

From a cryptographic perspective, though, both AES-CBC and AES-GCM are highly secure. GCM provides authentication, removing the need for an HMAC SHA hashing function. It is also slightly faster than CBC because it uses hardware acceleration (by threading to multiple processor cores).

Military grade encryption often refers to a specific encryption type, AES-256 (Advanced Encryption Standard). Currently, the U.S. government has named this algorithm the standard for encryption and most cybersecurity organizations today use this form of military grade encryption.

AES is largely considered impervious to all attacks, except for brute force, which attempts to decipher messages using all possible combinations in the 128, 192, or 256-bit cipher.

In a TLS cipher suite the ECDHE is for key exchange and the RSA is for server certificate authentication. Microsoft has a good explanation of cipher suite naming here.

A cipher suite is identified as obsolete when one or more of the mechanisms is weak. Especially weak encryption algorithms in TLS 1.2 are designated as NULL, RC2, RC4, DES, IDEA, and TDES/3DES; cipher suites using these algorithms should not be used9.

Use a Short List of Secure Cipher Suites: Choose only cipher suites that offer at least 128-bit encryption, or stronger when possible.