PGP Decrypt Tool

Private-key decryption with clear inputs and safeguards today. Works with armored blocks and file uploads. Download CSV or PDF summaries for auditing anytime easily.

This runs on your server. Use test keys, not production secrets. No keys are stored Temp files deleted

Decrypt form

Must include BEGIN/END blocks when armored.
Upload replaces the pasted message.
Key is processed and then discarded.
Required for protected private keys.
Used for signature verification only.
If signature is requested, provide sender key.
Reset Tip: install gnupg extension for speed.

Example data table

Case Input type Key provided Signature check Expected status Output note
Demo A Armored text block Private key + passphrase Off Decrypted Readable plaintext appears in result box.
Demo B Uploaded .asc file Private key + passphrase On Decrypted or Failed Shows signature status when sender key is present.
Demo C Corrupted message Wrong passphrase Off Failed Error explains what to verify and retry.

Replace demo blocks with real keys and ciphertext from your workflow.

Formula used

PGP decryption is built on number theory used in public-key cryptography. Many keys use RSA or ElGamal plus symmetric ciphers for the data.

  • RSA core math: message recovery uses modular exponentiation: m ≡ c^d (mod n).
  • Hybrid design: a random session key encrypts the message with a symmetric cipher.
  • Key wrapping: the session key is encrypted with the public key algorithm.
  • Integrity: modification detection uses hashes and packet checksums.

This tool delegates the packet parsing and crypto to GnuPG libraries.

How to use this tool

  1. Paste the armored PGP message, or upload the file.
  2. Paste your private key block into the key field.
  3. Enter your private-key passphrase, then click Decrypt.
  4. Optional: paste a sender public key and enable signature verification.
  5. Download a CSV or PDF summary for your audit trail.

For best privacy, run it on your own machine or VPS.

FAQs

1) Why does decryption fail even with my key?

Usually the passphrase is wrong, the message targets another subkey, or the text lost its armor lines. Re-paste the full block and retry.

2) Do you store my private key?

No. The tool reads your key for one request only. Temporary files are deleted immediately after decryption attempts.

3) What message formats are supported?

Armored PGP blocks are supported. Binary files work when uploaded, but your server must have a working GnuPG installation.

4) Can this verify signatures too?

Yes, when enabled and a sender public key is provided. The tool reads signature status from GnuPG output and shows it with the result.

5) Why is my output empty but status says OK?

Some messages decrypt into binary or structured data. Switch to JSON output for safe viewing, or save the plaintext and inspect it with the right application.

6) Is this safe for production secrets?

Only if your hosting is trusted and hardened. For maximum safety, decrypt locally and keep private keys off public servers.

7) Which engine does it use?

If the gnupg extension exists, it uses it. Otherwise it calls the system gpg binary using a temporary isolated home directory.

Implementation note: If your host blocks shell execution, enable the gnupg extension instead of using the gpg binary.

Related Calculators

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Important Note: All the Calculators listed in this site are for educational purpose only and we do not guarentee the accuracy of results. Please do consult with other sources as well.