Crypt4GH-JS Demo Website

Keypair generation:

1: Step (optional): to create a keypair a password can be chosen.

• If a password is chosen the secret key is encrypted. The password is needed for encryption and decryption.
• If no password is chosen, the secret key is not encrypted. No password is needed for encryption and decryption.

2: Step: After clicking the download button the secret and public key-files are downloaded.

For data encryption:

1. Step: upload the secret and public key file.

2. Step: upload the file, that is going to be encrypted or enter text to encrypt into the textfield.

3. Step (optional):, enter blocks or editlist (parameters to decide which parts of the file can be decrypted).

• Blocks: 64kb blocks of the original file. If added a single number for example '1', the first 64kb of the original file can be decrypted. If added a list for example '1,5', the first 64kb and the fifth 64kb of the original file can be decrypted.
• Editlist: a list containing bytes that will be skipped or decrypted. Example: the editlist '0,5,10,3' used on 'abcdefghijklmnopqrstuvwxyz' -> 'abcdepqr'. Odd entries are skipped, even entries are decrypted.

4. Step (optional): enter password, if a password was used to generate the key files.

5. Step: After clicking the submit button the encrypted c4gh-file can be downloaded.

For data decryption:

1. Step: upload the secret key file.

2. Step: choose the c4gh file for decryption

3. Step (optional): enter password, if a password was used to generate the key files.

4. Step: After clicking the submit button the decrypted file can be downloaded.