Supported protocols and ciphers between viewers and CloudFront
When you require HTTPS between viewers and your CloudFront distribution, you must choose a security policy, which determines the following settings:
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The minimum SSL/TLS protocol that CloudFront uses to communicate with viewers.
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The ciphers that CloudFront can use to encrypt the communication with viewers.
To choose a security policy, specify the applicable value for Security policy. The following table lists the protocols and ciphers that CloudFront can use for each security policy.
A viewer must support at least one of the supported ciphers to establish an HTTPS connection with CloudFront. CloudFront chooses a cipher in the listed order from among the ciphers that the viewer supports. See also OpenSSL, s2n, and RFC cipher names.
| Security policy | |||||||
|---|---|---|---|---|---|---|---|
| SSLv3 | TLSv1 | TLSv1_2016 | TLSv1.1_2016 | TLSv1.2_2018 | TLSv1.2_2019 | TLSv1.2_2021 | |
| Supported SSL/TLS protocols | |||||||
| TLSv1.3 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| TLSv1.2 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| TLSv1.1 | ♦ | ♦ | ♦ | ♦ | |||
| TLSv1 | ♦ | ♦ | ♦ | ||||
| SSLv3 | ♦ | ||||||
| Supported TLSv1.3 ciphers | |||||||
| TLS_AES_128_GCM_SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| TLS_AES_256_GCM_SHA384 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| TLS_CHACHA20_POLY1305_SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| Supported ECDSA ciphers | |||||||
| ECDHE-ECDSA-AES128-GCM-SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| ECDHE-ECDSA-AES128-SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | |
| ECDHE-ECDSA-AES128-SHA | ♦ | ♦ | ♦ | ♦ | |||
| ECDHE-ECDSA-AES256-GCM-SHA384 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| ECDHE-ECDSA-CHACHA20-POLY1305 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| ECDHE-ECDSA-AES256-SHA384 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | |
| ECDHE-ECDSA-AES256-SHA | ♦ | ♦ | ♦ | ♦ | |||
| Supported RSA ciphers | |||||||
| ECDHE-RSA-AES128-GCM-SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| ECDHE-RSA-AES128-SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | |
| ECDHE-RSA-AES128-SHA | ♦ | ♦ | ♦ | ♦ | |||
| ECDHE-RSA-AES256-GCM-SHA384 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| ECDHE-RSA-CHACHA20-POLY1305 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ |
| ECDHE-RSA-AES256-SHA384 | ♦ | ♦ | ♦ | ♦ | ♦ | ♦ | |
| ECDHE-RSA-AES256-SHA | ♦ | ♦ | ♦ | ♦ | |||
| AES128-GCM-SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ||
| AES256-GCM-SHA384 | ♦ | ♦ | ♦ | ♦ | ♦ | ||
| AES128-SHA256 | ♦ | ♦ | ♦ | ♦ | ♦ | ||
| AES256-SHA | ♦ | ♦ | ♦ | ♦ | |||
| AES128-SHA | ♦ | ♦ | ♦ | ♦ | |||
| DES-CBC3-SHA | ♦ | ♦ | |||||
| RC4-MD5 | ♦ | ||||||
OpenSSL, s2n, and RFC cipher names
OpenSSL and s2n
For ciphers with elliptic curve key exchange algorithms, CloudFront supports the following elliptic curvers:
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prime256v1
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secp384r1
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X25519
| OpenSSL and s2n cipher name | RFC cipher name |
|---|---|
| Supported TLSv1.3 ciphers | |
| TLS_AES_128_GCM_SHA256 | TLS_AES_128_GCM_SHA256 |
| TLS_AES_256_GCM_SHA384 | TLS_AES_256_GCM_SHA384 |
| TLS_CHACHA20_POLY1305_SHA256 | TLS_CHACHA20_POLY1305_SHA256 |
| Supported ECDSA ciphers | |
| ECDHE-ECDSA-AES128-GCM-SHA256 | TLS_ECDHE_ECDSA_WITH_AES_128_GCM_SHA256 |
| ECDHE-ECDSA-AES128-SHA256 | TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA256 |
| ECDHE-ECDSA-AES128-SHA | TLS_ECDHE_ECDSA_WITH_AES_128_CBC_SHA |
| ECDHE-ECDSA-AES256-GCM-SHA384 | TLS_ECDHE_ECDSA_WITH_AES_256_GCM_SHA384 |
| ECDHE-ECDSA-CHACHA20-POLY1305 | TLS_ECDHE_ECDSA_WITH_CHACHA20_POLY1305_SHA256 |
| ECDHE-ECDSA-AES256-SHA384 | TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA384 |
| ECDHE-ECDSA-AES256-SHA | TLS_ECDHE_ECDSA_WITH_AES_256_CBC_SHA |
| Supported RSA ciphers | |
| ECDHE-RSA-AES128-GCM-SHA256 | TLS_ECDHE_RSA_WITH_AES_128_GCM_SHA256 |
| ECDHE-RSA-AES128-SHA256 | TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA256 |
| ECDHE-RSA-AES128-SHA | TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA |
| ECDHE-RSA-AES256-GCM-SHA384 | TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 |
| ECDHE-RSA-CHACHA20-POLY1305 | TLS_ECDHE_RSA_WITH_CHACHA20_POLY1305_SHA256 |
| ECDHE-RSA-AES256-SHA384 | TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA384 |
| ECDHE-RSA-AES256-SHA | TLS_ECDHE_RSA_WITH_AES_256_CBC_SHA |
| AES128-GCM-SHA256 | TLS_RSA_WITH_AES_128_GCM_SHA256 |
| AES256-GCM-SHA384 | TLS_RSA_WITH_AES_256_GCM_SHA384 |
| AES128-SHA256 | TLS_RSA_WITH_AES_128_CBC_SHA256 |
| AES256-SHA | TLS_RSA_WITH_AES_256_CBC_SHA |
| AES128-SHA | TLS_RSA_WITH_AES_128_CBC_SHA |
| DES-CBC3-SHA | TLS_RSA_WITH_3DES_EDE_CBC_SHA |
| RC4-MD5 | TLS_RSA_WITH_RC4_128_MD5 |
Supported signature schemes between viewers and CloudFront
CloudFront supports the following signature schemes for connections between viewers and CloudFront.
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TLS_SIGNATURE_SCHEME_RSA_PSS_PSS_SHA256
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TLS_SIGNATURE_SCHEME_RSA_PSS_PSS_SHA384
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TLS_SIGNATURE_SCHEME_RSA_PSS_PSS_SHA512
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TLS_SIGNATURE_SCHEME_RSA_PSS_RSAE_SHA256
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TLS_SIGNATURE_SCHEME_RSA_PSS_RSAE_SHA384
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TLS_SIGNATURE_SCHEME_RSA_PSS_RSAE_SHA512
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TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA256
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TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA384
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TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA512
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TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA224
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TLS_SIGNATURE_SCHEME_ECDSA_SHA256
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TLS_SIGNATURE_SCHEME_ECDSA_SHA384
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TLS_SIGNATURE_SCHEME_ECDSA_SHA512
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TLS_SIGNATURE_SCHEME_ECDSA_SHA224
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TLS_SIGNATURE_SCHEME_ECDSA_SECP256R1_SHA256
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TLS_SIGNATURE_SCHEME_ECDSA_SECP384R1_SHA384
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TLS_SIGNATURE_SCHEME_RSA_PKCS1_SHA1
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TLS_SIGNATURE_SCHEME_ECDSA_SHA1
