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Some of the most frequent cryptographic errors include: • Hardcoding secrets in source code. • Using weak or outdated algorithms like MD5, SHA-1, or DES. • Reusing nonces in AES-GCM or ECDSA, which can expose encryption keys. • Using predictable random number generation (e.g., Math.random() instead of SecureRandom). • Misconfiguring SSL/TLS, leading to weak encryption or protocol downgrade attacks.
Hardcoded keys can be easily extracted from code repositories, mobile apps, or reverse-engineered binaries. If an attacker gains access, they can decrypt sensitive data or impersonate legitimate users. Fix: Use environment variables or secrets management tools like AWS Secrets Manager, HashiCorp Vault, or Azure Key Vault.
A nonce (number used once) should never be reused because: • In AES-GCM, nonce reuse leaks authentication keys, allowing message forgery. • In ECDSA, reusing a nonce can expose private signing keys (e.g., PlayStation 3 hack). • Fix: Always generate nonces using a cryptographically secure random number generator (CSPRNG) or use counter-based nonces with safeguards.
MD5 and SHA-1 are vulnerable to collision attacks, where different inputs can produce the same hash. This allows attackers to forge data integrity checks. Fix: Use SHA-256, SHA-3, or Argon2/PBKDF2 for password hashing.
AES-ECB (Electronic Codebook) mode encrypts identical plaintext blocks into identical ciphertext blocks, leaking patterns in encrypted data. Fix: Use AES-GCM (preferred) or AES-CBC with HMAC for authenticated encryption.
Weak randomness can make keys, session tokens, and cryptographic nonces predictable. For example: • Math.random() in JavaScript is not cryptographically secure. • Using predictable seeds (System.currentTimeMillis()) in SecureRandom reduces entropy and makes keys guessable. Fix: Use SecureRandom (Java), crypto.getRandomValues() (JavaScript), or /dev/urandom (Linux). Never manually seed CSPRNGs.
Using the same key for encryption and signing introduces systemic vulnerabilities. If an attacker gains access to one, they can decrypt or forge messages. Fix: Use separate encryption keys (AES-GCM, XChaCha20) and signing keys (Ed25519, HMAC-SHA-256).
Avoid storing keys in plaintext configuration files, source code, or logs. Best practices: • Use cloud KMS (AWS KMS, Google Cloud KMS, HashiCorp Vault) for secure storage. • Implement key rotation every 90 days. • Apply least privilege access (IAM roles, ACLs) to limit key exposure.
Common SSL/TLS mistakes include: • Allowing weak protocols (SSL 2.0, SSL 3.0, TLS 1.0/1.1). • Using weak ciphers (RC4, 3DES, NULL ciphers). • Disabling certificate validation, making systems vulnerable to man-in-the-middle attacks. Fix: • Enforce TLS 1.2 or 1.3. • Use ECDHE for key exchange and AES-GCM for encryption. • Verify SSL/TLS certificates properly and enable OCSP stapling.
Cryptography is highly complex, and even minor mistakes can introduce severe vulnerabilities. Custom algorithms or protocols lack peer review and cryptanalysis, making them unsafe. Fix: Always use well-vetted cryptographic libraries like OpenSSL, libsodium, or Bouncy Castle instead of writing your own encryption functions.

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Koushik M.
"Exceptional Hands-On Security Learning Platform"

Varunsainadh K.
"Practical Security Training with Real-World Labs"

Gaël Z.
"A new generation platform showing both attacks and remediations"

Nanak S.
"Best resource to learn for appsec and product security"





.png)



Koushik M.
"Exceptional Hands-On Security Learning Platform"

Varunsainadh K.
"Practical Security Training with Real-World Labs"

Gaël Z.
"A new generation platform showing both attacks and remediations"

Nanak S.
"Best resource to learn for appsec and product security"




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