https://www.mankier.com/1/openssl-enc.1ossl
openssl-enc.1ossl: symmetric cipher routines | Man Page | Commands | openssl | ManKier
symmetric cipher routines
symmetric cipherman pageopensslencroutines
https://mojoauth.com/security-guides/chacha20-256-vs-xtea-128
ChaCha20 vs XTEA: Symmetric Cipher Comparison | MojoAuth Security Guides
ChaCha20-256 vs XTEA-128 for developers: key generation and management, modes and IVs, and library integration best practices for each cipher.
symmetric cipherxteacomparisonsecurityguides
https://lists.gnupg.org/pipermail/gnupg-users/2016-February/055383.html
cipher used when both --encrypt and --symmetric is specified
cipherusedencryptsymmetricspecified