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| e92057 | Samuli Seppänen | 2025-02-11 11:26:09 | 1 | # On Slackware, I get the error: Cipher algorithm 'BF-CBC' not found (OpenSSL) |
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| 3 | **NOTE: this article is very outdated. Modern OpenVPN negotiates ciphers between peers and --cipher is a no-op since OpenVPN 2.6. As such you're unlikely to encounter this issue anymore.** |
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| 5 | By default, OpenVPN uses the *blowfish* cipher for tunnel encryption. For some reason, some versions of Slackware have an OpenSSL library built without Blowfish cipher support. |
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| 7 | The fix is either: |
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| 8 | - Rebuild the OpenSSL library to include blowfish, or |
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| 9 | - Use the `--cipher` option to choose a different cipher. The command `openvpn --show-ciphers` will show the available ciphers. For example `--cipher DES-EDE3-CBC` will select Triple-DES encryption. |