DES, TripleDES, RC2, RC4, Blowfish, IDEA, CAST5, and SEED are broken or risky cryptographic algorithms. DES and TripleDES are disallowed per NIST SP 800-131A Rev 2; RC2, RC4, Blowfish, IDEA, CAST5, and SEED are not NIST-approved and have known weaknesses. Use AES-256-GCM or ChaCha20-Poly1305 instead.