В настоящее время Heroku поддерживает следующие шифры:
Вы можете обнаружить, что, как с помощью SSL Тест ssllab.com: https://www.ssllabs.com/ssltest/analyze.html?d=heroku.com&s=23.21.198.2
TLS_RSA_WITH_RC4_128_SHA (0x5) 128
TLS_RSA_WITH_AES_128_CBC_SHA (0x2f) 128
TLS_DHE_RSA_WITH_AES_128_CBC_SHA (0x33) DH 1024 bits (p: 128, g: 128, Ys: 128) FS 128
TLS_RSA_WITH_CAMELLIA_128_CBC_SHA (0x41) 128
TLS_DHE_RSA_WITH_CAMELLIA_128_CBC_SHA (0x45) DH 1024 bits (p: 128, g: 128, Ys: 128) FS 128
TLS_ECDHE_RSA_WITH_RC4_128_SHA (0xc011) ECDH 233 bits (eq. 2048 bits RSA) FS 128
TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA (0xc013) ECDH 233 bits (eq. 2048 bits RSA) FS 128
TLS_RSA_WITH_3DES_EDE_CBC_SHA (0xa) 168
TLS_DHE_RSA_WITH_3DES_EDE_CBC_SHA (0x16) DH 1024 bits (p: 128, g: 128, Ys: 128) FS 168
TLS_ECDHE_RSA_WITH_3DES_EDE_CBC_SHA (0xc012) ECDH 233 bits (eq. 2048 bits RSA) FS 168
TLS_RSA_WITH_AES_256_CBC_SHA (0x35) 256
TLS_DHE_RSA_WITH_AES_256_CBC_SHA (0x39) DH 1024 bits (p: 128, g: 128, Ys: 128) FS 256
TLS_RSA_WITH_CAMELLIA_256_CBC_SHA (0x84) 256
TLS_DHE_RSA_WITH_CAMELLIA_256_CBC_SHA (0x88) DH 1024 bits (p: 128, g: 128, Ys: 128) FS 256
TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA (0xc014) ECDH 233 bits (eq. 2048 bits RSA) FS