Research Article
A Secure and Anonymous Two-Factor Authentication Protocol in Multiserver Environment
Table 1
Notations and abbreviations
| Symbol | Description |
| | th user | | th remote server | | The register center | | The adversary | | The secret key of | | Identity of | | Password of | | Identity of | | The shared secret key between and | | Bitwise XOR operation | | Concatenation operation | | One-way hash function | | A common channel | | A secure channel |
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