[gnutls-devel] gnutls-cli and invoke-gnutls-cli.texi disagree

Tim Ruehsen tim.ruehsen at gmx.de
Fri Sep 6 12:52:15 CEST 2013


Hi,

regarding GnuTLS 3.2.4:

The docs (invoke-gnutls-cli.texi) say 
Cipher suites for SECURE192
TLS_ECDHE_ECDSA_AES_256_CBC_SHA384         0xc0, 0x24   TLS1.2
TLS_ECDHE_ECDSA_AES_256_GCM_SHA384         0xc0, 0x2e   TLS1.2
TLS_ECDHE_RSA_AES_256_GCM_SHA384           0xc0, 0x30   TLS1.2
TLS_DHE_RSA_AES_256_CBC_SHA256             0x00, 0x6b   TLS1.2
TLS_DHE_DSS_AES_256_CBC_SHA256             0x00, 0x6a   TLS1.2
TLS_RSA_AES_256_CBC_SHA256                 0x00, 0x3d   TLS1.2

while the invokation of 'gnutls-cli --priority SECURE192 -l'
says:
Cipher suites for SECURE192
TLS_ECDHE_ECDSA_AES_256_CBC_SHA384                      0xc0, 0x24      TLS1.2
TLS_ECDHE_ECDSA_AES_256_GCM_SHA384                      0xc0, 0x2c      TLS1.2
TLS_ECDHE_RSA_AES_256_GCM_SHA384                        0xc0, 0x30      TLS1.2
TLS_RSA_AES_256_CBC_SHA256                              0x00, 0x3d      TLS1.2
TLS_DHE_RSA_AES_256_CBC_SHA256                          0x00, 0x6b      TLS1.2
TLS_DHE_DSS_AES_256_CBC_SHA256                          0x00, 0x6a      TLS1.2

Shouldn't the DHE key exchange be preferred to RSA, like the docs say ?
If I understood it correctly, DHE is more secure in means of 'Perfect Forward 
Security'. 
Could someone bring some light in here ?

Regards, Tim




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