CryptographyDEV
Text encoding, cryptographic hashing, symmetric & asymmetric encryption.
About Cryptography Toolkit
Overview
This toolkit integrates 20+ industry-standard cryptographic algorithms, covering four major categories: text encoding, cryptographic hashing, symmetric encryption, and asymmetric encryption.
100% Client-Side Processing—
Zero Network Transmission:
All cryptographic operations are performed locally on your device. All sensitive data (plaintext, ciphertext, keys, etc.) never leaves your device, ensuring complete privacy and security.
Select a specific algorithm to view detailed technical documentation, including algorithm history, security analysis, recommended parameters, and professional guidance.
100% Client-Side Processing—
Zero Network Transmission:
All cryptographic operations are performed locally on your device. All sensitive data (plaintext, ciphertext, keys, etc.) never leaves your device, ensuring complete privacy and security.
Select a specific algorithm to view detailed technical documentation, including algorithm history, security analysis, recommended parameters, and professional guidance.
HMAC-SHA256
HMAC-SHA256 (Hash-based Message Authentication Code) combines SHA-256 with a secret key to provide message authentication. Defined by RFC 2104, it's the most widely used MAC algorithm.
Key Features: Uses a key and message as input, generating a fixed-length authentication code through two hash operations. Verifies both data integrity and message authenticity—only key holders can generate valid HMACs.
Security: Inherits SHA-256's security while preventing forgery through the key mechanism. Attackers cannot forge valid HMACs without the key, even if they know the message and HMAC value. Resistant to length extension attacks—more secure than simple Hash(key||message).
Why Use This: HMAC-SHA256 is the industry standard for API signing, JWT tokens, and webhook verification. Used by AWS, GitHub, Stripe, and virtually all major platforms for API authentication.
Use Cases:
• API Signing: Verify request authenticity and integrity
• JWT Tokens: HS256 algorithm (most common JWT signing)
• Webhooks: Verify callbacks from trusted sources
• Cookie Signing: Prevent cookie tampering
• Password Derivation: Core component of PBKDF2
Recommended as the primary choice for API authentication and data integrity verification.
Key Features: Uses a key and message as input, generating a fixed-length authentication code through two hash operations. Verifies both data integrity and message authenticity—only key holders can generate valid HMACs.
Security: Inherits SHA-256's security while preventing forgery through the key mechanism. Attackers cannot forge valid HMACs without the key, even if they know the message and HMAC value. Resistant to length extension attacks—more secure than simple Hash(key||message).
Why Use This: HMAC-SHA256 is the industry standard for API signing, JWT tokens, and webhook verification. Used by AWS, GitHub, Stripe, and virtually all major platforms for API authentication.
Use Cases:
• API Signing: Verify request authenticity and integrity
• JWT Tokens: HS256 algorithm (most common JWT signing)
• Webhooks: Verify callbacks from trusted sources
• Cookie Signing: Prevent cookie tampering
• Password Derivation: Core component of PBKDF2
Recommended as the primary choice for API authentication and data integrity verification.