The core issue is a . When data is encrypted using block ciphers (like AES), the plaintext must be a multiple of the block size (usually 16 bytes). PKCS#7 padding fills the remaining space. For example, if 3 bytes are needed, the padding will be \x03\x03\x03 .
This means:
| Threat | Mitigation | |--------|-------------| | Server breach | Attacker gets only ciphertext (without keys, it’s useless). | | Insider threat (malicious admin) | Cannot read pastes. | | MITM on server connection | TLS protects ciphertext in transit; key is never transmitted. | | Permanent data leakage | No plaintext ever stored. | | Brute‑forcing keys | Key space is ~128+ bits; browser‑generated random values are cryptographically strong. | hacker101 encrypted pastebin
Download the PrivateBin source code and verify the SHA256 hash locally, or use a browser extension that checks for SRI (Subresource Integrity) hashes. The core issue is a