Tor TLS cipher suite negotiation and fingerprint defense

1. Why is TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 considered weak?
2. Why is TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 considered weak?
3. Is tls_aes_256_gcm_sha384 secure?
4. What is TLS cipher suites?
5. What is tls_aes_128_gcm_sha256?
6. What ciphers should I disable?
7. How do I disable insecure ciphers?
8. Is TLS_RSA_WITH_AES_128_GCM_SHA256 weak?
9. Which TLS ciphers are secure?
10. Is TLS_RSA_WITH_AES_256_GCM_SHA384 secure?
11. What cipher suites does TLS 1.2 use?
12. Should I disable cipher suites?
13. Can TLS encryption be hacked?
14. What are the 3 main security purposes of TLS?
15. Is TLS_RSA_WITH_AES_128_GCM_SHA256 weak?
16. Is TLS_RSA_WITH_AES_256_GCM_SHA384 secure?
17. Are DHE ciphers weak?
18. What is weak SSL TLS key exchange?
19. What ciphers should be disabled?
20. How do I disable weak TLS ciphers?
21. What are the list of weak TLS ciphers?
22. What does TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 mean?
23. Which TLS is unsecure?
24. What TLS ciphers should I use?

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 a 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.

Why is TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 considered weak?

Shall I know why TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 being treated as weak? When did it become weak? Thanks. Due to the difficulties in implementing CBC cipher suites, and the numerous known exploits against bugs in specific implementations, Qualys SSL Labs began marking all CBC cipher suites as WEAK in May 2019.

Is tls_aes_256_gcm_sha384 secure?

message authentication code is a hashed message authentication code which is considered secure. The underlaying cryptographic hash function (Secure Hash Algorithm 2) is also considered secure.

What is TLS cipher suites?

A cipher suite is a set of cryptographic algorithms. The schannel SSP implementation of the TLS/SSL protocols use algorithms from a cipher suite to create keys and encrypt information. A cipher suite specifies one algorithm for each of the following tasks: Key exchange.

What is tls_aes_128_gcm_sha256?

tls_aes_128_gcm_sha256. TLS: protocol. Authenticated Encryption with Associated Data (AEAD) cipher mode : AES with 128 key GCM.

What ciphers should I disable?

If you must still support TLS 1.0, disable TLS 1.0 compression to avoid CRIME attacks. You should also disable weak ciphers such as DES and RC4. DES can be broken in a few hours and RC4 has been found to be weaker than previously thought. In the past, RC4 was advised as a way to mitigate BEAST attacks.

How do I disable insecure ciphers?

You can do this using GPO or Local security policy under Computer configuration -> Administrative Templates -> Network -> SSL Configuration Settings -> SSL Cipher Suite Order. Set this policy to enable.

Is TLS_RSA_WITH_AES_128_GCM_SHA256 weak?

I ran a test on a site and it showed TLS_RSA_WITH_AES_128_GCM_SHA256 is a weak cipher, but according to IBM Knowledge Center it shows to be a medium to high strength cipher. IBM might have their own criteria as their deciding factor for the weakness of a cipher suite.

Which TLS ciphers are secure?

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.

Is TLS_RSA_WITH_AES_256_GCM_SHA384 secure?

TLS_RSA_WITH_AES_256_GCM_SHA384 has two problems: It relies on RSA PKCS#1v1. 5 decryption, so it is potentially vulnerable to a padding oracle attack: Bleichenbacher's attack and similar attacks (in particular Manger's attack) and variants.

What cipher suites does TLS 1.2 use?

The secure suites to be used in TLS 1.2 are: TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256. TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384. TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256.

Should I disable cipher suites?

The purpose is to use the most secure protocols, cipher suites and hashing algorithms that both ends support. To use the strongest ciphers and algorithms it's important to disable the ciphers and algorithms you no longer want to see used.

Can TLS encryption be hacked?

What is the Raccoon Attack? The Raccoon attack is a newly discovered vulnerability in TLS 1.2 and earlier versions. It allows hackers (in certain situations) to determine a shared session key and use that to decrypt TLS communications between the server and client.

What are the 3 main security purposes of TLS?

There are three main components to what the TLS protocol accomplishes: Encryption, Authentication, and Integrity.

Is TLS_RSA_WITH_AES_128_GCM_SHA256 weak?

I ran a test on a site and it showed TLS_RSA_WITH_AES_128_GCM_SHA256 is a weak cipher, but according to IBM Knowledge Center it shows to be a medium to high strength cipher. IBM might have their own criteria as their deciding factor for the weakness of a cipher suite.

Is TLS_RSA_WITH_AES_256_GCM_SHA384 secure?

TLS_RSA_WITH_AES_256_GCM_SHA384 has two problems: It relies on RSA PKCS#1v1. 5 decryption, so it is potentially vulnerable to a padding oracle attack: Bleichenbacher's attack and similar attacks (in particular Manger's attack) and variants.

Are DHE ciphers weak?

Support Solution. The DHE 1024 bit cipher is considered to be a weak cipher by Qualys and other SSL scanning tools.

What is weak SSL TLS key exchange?

Weak SSL/TLS Ciphers

TLS (Transport Layer Security) uses a pseudo-random function to generate a master secret. THREAT: Key exchanges that are cryptographically weaker than recommended are supported by the SSL (Secure Socket Layer)/ TLS (Transport Layer Security) server.

What ciphers should be disabled?

If you must still support TLS 1.0, disable TLS 1.0 compression to avoid CRIME attacks. You should also disable weak ciphers such as DES and RC4. DES can be broken in a few hours and RC4 has been found to be weaker than previously thought.

How do I disable weak TLS ciphers?

You can do this using GPO or Local security policy under Computer configuration -> Administrative Templates -> Network -> SSL Configuration Settings -> SSL Cipher Suite Order. Set this policy to enable. Each cipher suite should be separated with a comma. Remove as needed based on the list below.

What are the list of weak TLS ciphers?

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.

What does TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 mean?

Each segment in a cipher suite name stands for a different algorithm or protocol. An example of a cipher suite name: TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256. The meaning of this name is: TLS defines the protocol that this cipher suite is for; it will usually be TLS. ECDHE indicates the key exchange algorithm being used.

Which TLS is unsecure?

SSL version 1 and 2, SSLv2 and SSLv3 are now insecure. It is also recommended to phase out TLS 1.0 and TLS 1.1. We recommend that you disable SSLv2, SSLv3, TLS 1.0 and TLS 1.1 in your server configuration so that only the newer TLS protocols can be used. It is recommended to only enable TLS 1.3 for maximum security.

What TLS ciphers should I use?

To date, only TLS 1.2 and TLS 1.3 are considered safe protocols for network connections, and each of them supports only a specific number of cipher suite combinations.