Articles about cryptography | UserComp.com

Understanding Openwall and John the Ripper: No John Command Parameters

Resolve John the Ripper usage summary by specifying hash format and input files via command line parameters.

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Recover Machine Key that was not marked as exportable upon creation

Resolve the inability to use a non-exportable machine key after hardware failure by restoring from backup or leveraging DPAPI for data continuity.

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Memory Alloc Space / Leak Problem in Golang

Resolve high memory allocation and potential leaks in Go services on Amazon ECS by reusing buffers for cryptographic operations and properly closing resources.

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GPG: Importing an Invalid secp256k1 Public Key

Resolve GPG import errors for invalid secp256k1 keys by diagnosing malformed data and ensuring proper OpenPGP packet structure.

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Understanding Different Hash Values in SSH-Keygen SHA256

Resolve SSH host key verification errors by understanding and validating SHA256 fingerprints to prevent man-in-the-middle attacks.

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ARC4 Decryption Succeeding on SMSG_AUTH_RESPONSE but Failing on SMSG_CHAR_ENUM

Fix ARC4 decryption failure on SMSG_CHAR_ENUM by ensuring ciphertext slicing excludes the unencrypted length header to prevent byte desynchronization.

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Exporting non-exportable private key for .cer from Windows Certificate Manager

Non-exportable private keys cannot be extracted from Windows Certificate Manager; you must re-issue the certificate on the target machine to generate a new key pair.

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