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.
AES
AES (Advanced Encryption Standard) is the NIST-approved symmetric encryption standard published in 2001, replacing DES. Based on the Rijndael cipher, it supports 128, 192, and 256-bit keys.
Key Features: Uses a substitution-permutation network (SPN) with excellent security and performance. Modern CPUs provide AES-NI hardware acceleration, making AES extremely fast. It's the most widely used symmetric cipher, secure after 20+ years of cryptanalysis.
Modes of Operation:
• CBC (Recommended): Requires 16-byte IV (Initialization Vector). Each block's encryption depends on the previous block, ensuring identical plaintext produces different ciphertext at different positions. IVs must be randomly generated and never reused.
• ECB (Avoid): No IV required, but cryptographically weak. Identical plaintext blocks always produce identical ciphertext, leaking data patterns. Avoid ECB except for specific edge cases.
• CTR (Recommended): Requires 16-byte nonce/IV. Converts block cipher to stream cipher, enabling parallel encryption with excellent performance.
• GCM (Strongly Recommended): Requires 12-byte nonce. An Authenticated Encryption with Associated Data (AEAD) mode combining CTR encryption with GMAC authentication. Provides both confidentiality and integrity, preventing tampering, replay, and chosen-ciphertext attacks. Adopted by TLS 1.3, QUIC, and IPsec. Critical: Never reuse nonces—reuse causes catastrophic security failure.
Key Lengths: AES-128 is sufficient for most applications; AES-256 provides additional security margin. U.S. government requires AES-256 for TOP SECRET data.
Why Use This: AES is the gold standard for symmetric encryption, used in TLS, VPNs, disk encryption, and virtually all secure systems. Thoroughly vetted by global cryptographers with proven security. For new projects, use AES-256-GCM; for legacy systems, use AES-256-CBC or AES-256-CTR.
Key Features: Uses a substitution-permutation network (SPN) with excellent security and performance. Modern CPUs provide AES-NI hardware acceleration, making AES extremely fast. It's the most widely used symmetric cipher, secure after 20+ years of cryptanalysis.
Modes of Operation:
• CBC (Recommended): Requires 16-byte IV (Initialization Vector). Each block's encryption depends on the previous block, ensuring identical plaintext produces different ciphertext at different positions. IVs must be randomly generated and never reused.
• ECB (Avoid): No IV required, but cryptographically weak. Identical plaintext blocks always produce identical ciphertext, leaking data patterns. Avoid ECB except for specific edge cases.
• CTR (Recommended): Requires 16-byte nonce/IV. Converts block cipher to stream cipher, enabling parallel encryption with excellent performance.
• GCM (Strongly Recommended): Requires 12-byte nonce. An Authenticated Encryption with Associated Data (AEAD) mode combining CTR encryption with GMAC authentication. Provides both confidentiality and integrity, preventing tampering, replay, and chosen-ciphertext attacks. Adopted by TLS 1.3, QUIC, and IPsec. Critical: Never reuse nonces—reuse causes catastrophic security failure.
Key Lengths: AES-128 is sufficient for most applications; AES-256 provides additional security margin. U.S. government requires AES-256 for TOP SECRET data.
Why Use This: AES is the gold standard for symmetric encryption, used in TLS, VPNs, disk encryption, and virtually all secure systems. Thoroughly vetted by global cryptographers with proven security. For new projects, use AES-256-GCM; for legacy systems, use AES-256-CBC or AES-256-CTR.