| 2FA: | Two-Factor Authentication |
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| 3DES: | Triple Data Encryption Algorithm |
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| AES: | Advanced Encryption Standard |
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| BSI: | Bundesamt für Sicherheit in der Informationstechnik |
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| CC: | Common Criteria |
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| CCC: | Card Capability Container |
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| CCID: | Chip card interface device, a USB protocol for a smartcard. |
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| CHUID: | Card Holder Unique ID |
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| CMS: | Credential Management System |
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| CN: | Common name |
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| CSPN: | Certificat de Sécurité de Premier Niveau |
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| CSR: | Certificate Signing Request |
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| CTAP2: | Client to Authenticator Protocol v2 |
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| DES: | Data Encryption Standard |
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| ECC: | Elliptic curve cryptography |
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| FIDO: | Fast Identity Online |
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| FIPS: | Federal Information Processing Standards (US government) covering codes and encryption standards. |
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| HMAC: | Hash-based message authentication code |
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| HOTP: | HMAC-based One-Time Password algorithm |
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| KDF: | Key Derivation Function |
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| NIST: | National Institute of Standards and Technology |
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| OATH: | The Initiative for Open Authentication is an organization that specifies two open authentication standards, TOTP and HOTP. |
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| OTP: | One-Time Password |
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| PBKDF2: | Password-Based Key Derivation Function 2 |
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| PIN: | Personal Identification Number |
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| PIV: | Personal Identity Verification |
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| PKCS #11: | This is number eleven of the Public Key Cryptography Standards; it is also the API for creating and manipulating cryptographic tokens. |
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| PUK: | PIN Unblocking Key |
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| RFC: | Request For Comments |
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| SHA: | Secure Hash Algorithm |
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| stdin: | standard input - usually keyboard or CLI instructions |
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| stdout: | standard output - usually print to screen |
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| TOTP: | Time-based One-Time Password algorithm |
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| U2F: | Universal Second Factor |
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| W3C: | World Wide Web Consortium |
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| X.509: | The standard defining the format of a public key certificate |
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