Hi, I found that in GnuTLS, SHA256 is not used in any cipher suites (i.e. not listed in gnutls-cli -l). However, they are defined in RFC 5246, e.g. TLS_RSA_WITH_AES_128_CBC_SHA256 (0x00,0x3C). I wonder why they are not supported in GnuTLS as they can provide a higher security level. Thanks for your answers! Regards, Xizhi