A. Symmetric algorithms such as AES provide a failsafe when asymmetric methods fail.
B. Asymmetric cryptography is computationally expensive in comparison. However, it is well-suited to securely negotiate keys for use with symmetric cryptography.
C. Symmetric encryption allows the server to securely transmit the session keys out-of-band.
D. Supporting both types of algorithms allows less-powerful devices such as mobile phones to use symmetric encryption instead.
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