🧞‍♀️API Security Cheat Sheet PART - 9

Complex Authentication Techniques and Their Security Implications

Negative Numbers as Strings
```
{"login": "-123",
 "password": "-456"}
```
Description: Uses negative numbers in string format, emphasizing the need for handling numeric values correctly.
Values as URLs
```
{"login": "https://admin.com",
 "password": "https://password.com"}
```
Description: Incorporates URLs as values, highlighting the importance of parsing and validating URL formats.
Strings with Email Format
```
{"login": "admin@admin.com",
 "password": "password@password.com"}
```
Description: Features email addresses, underscoring the need for handling specific formats within string values.
Strings with IP Address Format
```
{"login": "192.0.2.0",
 "password": "203.0.113.0"}
```
Description: Utilizes IP address formats, stressing the importance of recognizing and validating various data formats.
Strings with Date Format
```
{"login": "2023-08-03",
 "password": "2023-08-04"}
```
Description: Contains date formats, indicating the necessity to handle date strings appropriately.
JSON with Exponential Values
```
{"login": 1e+30,
 "password": 1e+30}
```
Description: Demonstrates the use of exponential numeric values, emphasizing the need for proper numeric format handling.
JSON with Negative Exponential Values
```
{"login": -1e+30,
 "password": -1e+30}
```
Description: Features negative exponential numbers, pointing out the necessity for handling a wide range of numeric expressions.
Using Zero Width Space (U+200B) in Strings
```
{"login": "admin\u200B",
 "password": "password\u200B"}
```
Description: Incorporates zero-width spaces, highlighting the challenges in detecting and handling invisible characters.
Using Zero Width Joiner (U+200D) in Strings
```
{"login": "admin\u200D",
 "password": "password\u200D"}
```
Description: Uses zero-width joiners, emphasizing the subtleties of managing special Unicode characters.
JSON with Extremely Large Numbers
```
{"login": 12345678901234567890,
 "password": 12345678901234567890}
```
Description: Features extraordinarily large numbers, underscoring the need for handling large numeric values in JSON.

This comprehensive list of API authentication scenarios serves to guide developers and security professionals in understanding and preparing for various complex challenges in API security. Each scenario brings to light the importance of versatile validation, parsing, and sanitization strategies, crucial for maintaining a secure API infrastructure.

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