Last updated：2021-03-15 15:37:50
From January 1, 2017, Apple requires that all applications in the iOS Apple Store use HTTPS for encrypted data transmission. App Transport Security (ATS) forces the following rigid requirements:
Use TLS 1.2 or higher. TLS is the successor protocol to SSL.
The communication encryption suite must support forward secrecy.
Digital certificates must use SHA256 or a higher-level signature hash algorithm. The keys must be RSA keys with 2048 bits or more, or ECC keys with 256 bits or more.
Updates for applications in the Apple Store that had passed verification before January 1, 2017 must pass a second verification based on ATS. HTTPS is not required only on the following items: browsers, video and audio resources, applications that use Apple lower-layer network APIs, use third-party network library APIs, or call the Safari process to load pages.
To use HTTPS for encrypted data transmission, use a DV or OV certificate.
To satisfy higher encryption requirements and display organization information in the web browser address bar, use an EV certificate.
For applications to use HTTPS for encrypted data transmission, use an OV certificate.
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