For symmetric keys, Base64 encoding is not a conversion – you’d just encode it, which is reversible and does not increase security.
| Format | Metadata | User-Friendly | Verifiable | Recommended for average user | |--------|----------|---------------|------------|-------------------------------| | encryption-key.bin | None | ❌ No | ❌ No | ❌ No | | .kdbx (Keepass) | Yes (header, version, cipher) | ✅ Yes (GUI) | ✅ Yes (HMAC) | ✅ Yes | | .p12 / .pfx (PKCS#12) | Yes (friendly name, issuer) | ⚠️ Moderate | ✅ Yes | ✅ Yes (with passphrase) | | .enc + separate key | None | ❌ No | ❌ No | ❌ No | | Recovery phrase (12–24 words) | None (but human-readable) | ✅ Yes | ⚠️ No (must trust generation) | ✅ Yes | Encryption-key.bin File Download
| User Type | Recommendation | |-----------|----------------| | | Delete immediately. Never download or use a standalone .bin key file. Demand a password-manager backup or recovery phrase instead. | | IT professional | Acceptable only if part of a documented system with hash verification. Prefer PKCS#8 or .key with PEM headers. | | Developer | Avoid generating raw .bin keys for end users. Use standard formats (JWK, PEM, PKCS#12) with metadata. | For symmetric keys, Base64 encoding is not a