Mike Schleif wrote: > $ gpg --version > gpg (GnuPG) 2.0.22 > libgcrypt 1.5.3 > > $ cat /etc/system-release > CentOS Linux release 7.9.2009 (Core)
Algorithm 18 is ECDH, which is not supported by gpg on CentOS 7. You can confirm this in the Pubkey line of the gpg --version output: $ gpg --version gpg (GnuPG) 2.0.22 libgcrypt 1.5.3 [...] Home: ~/.gnupg Supported algorithms: Pubkey: RSA, ?, ?, ELG, DSA Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH, CAMELLIA128, CAMELLIA192, CAMELLIA256 Hash: MD5, SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224 Compression: Uncompressed, ZIP, ZLIB, BZIP2 On a newer Fedora system, ECDH is present: $ gpg --version --no-copyright gpg (GnuPG) 2.4.0 libgcrypt 1.10.1-unknown [...] Home: /home/user/.gnupg Supported algorithms: Pubkey: RSA, ELG, DSA, ECDH, ECDSA, EDDSA Cipher: IDEA, 3DES, CAST5, BLOWFISH, AES, AES192, AES256, TWOFISH, CAMELLIA128, CAMELLIA192, CAMELLIA256 Hash: SHA1, RIPEMD160, SHA256, SHA384, SHA512, SHA224 Compression: Uncompressed, ZIP, ZLIB, BZIP2 -- Todd
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