Weak TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256
- IANA name:
- TLS_DHE_PSK_WITH_CHACHA20_POLY1305_SHA256
- OpenSSL name:
- DHE-PSK-CHACHA20-POLY1305
- GnuTLS name:
- TLS_DHE_PSK_CHACHA20_POLY1305
- Hex code:
- 0xCC, 0xAD
- TLS Version(s):
- TLS1.2, TLS1.3
- Protocol:
- Transport Layer Security (TLS)
- Key Exchange:
- PFS Diffie-Hellman Ephemeral (DHE)
- Authentication:
- Pre-Shared Key (PSK)
- Encryption:
- AEAD ChaCha stream cipher and Poly1305 authenticator (CHACHA20 POLY1305)
- Hash:
- Secure Hash Algorithm 256 (SHA256)
- Included in RFC:
- Machine-readable:
- application/json
DHEat Attack:
The so-called DHEat Attack affects cryptographic protocols using the Diffie Hellman key exchange (incl. TLS). According to its authors, it exploits a protocol particularity that may allow attackers to perform a DoS attack "with a low-bandwidth network connection without authentication, privilege, or user interaction."
Raccoon Attack:
The so-called Raccoon Attack affects the specifications of TLS 1.2 and below when using a DH(E) key exchange. According to the researchers, while very hard to exploit, in rare circumstances this timing attack allows attackers to decrypt the connection between users and the server. A fix has been introduced in the TLS 1.3 specification.