[Ach] Thanks for the Logjam blog-post

Adi Kriegisch adi at kriegisch.at
Thu May 21 14:39:26 CEST 2015


Hey!

> >> openssl s_client -connect bettercrypto.org:443 -cipher
> > "DHE-RSA-AES128-SHA"
> > Yes, that works on Ubuntu 14.04, 12.10 and Debian Wheezy
> > 
> ... but only prints
> 
>   Server public key is XYZW bits
> 
> and not
> 
>   Server Temp Key: DH, ABCD bits
IIRC one needs openssl v1.0.2 to get the DH param info; for other systems
using gnutls-cli might work:
  | gnutls-cli bettercrypto.org
  | (...)
  | - Description: (TLS1.2)-(DHE-RSA-4096)-(AES-128-GCM)
  | - Session ID: (...)
  | - Ephemeral Diffie-Hellman parameters
  |  - Using prime: 4096 bits
  |  - Secret key: 1023 bits
  |  - Peer's public key: 4094 bits
  | - Version: TLS1.2
  | - Key Exchange: DHE-RSA
  | - Server Signature: RSA-SHA256
  | - Cipher: AES-128-GCM
  | - MAC: AEAD
  | - Compression: NULL
  | - Handshake was completed
 
-- Adi
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