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How to Encrypt?
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- Type your message/text. OR the message can be copy/pasted from other
text editors.
- Enter the encryption key. The key can be maximum 8 characters wide.
- It is advisable to use the full 8 character keys.
- Press the "Encrypt" button.
- A header
^ENCMVSSTART^---------------------------------------------------
is added to the encrypted text and a footer
^ENCMVSEND ^---------------------------------------------------
is suffixed.
- The encrypted text contains only ASCII text and can be copy / pasted into any applciation.
It can be pasted into the client (even send it through Hotmail, USA.net or any
web basied email).
- The receiver of the mail has to copy/paste the encrypted message into Cryptopad and
key in the Encryption Key and press Decrypt button.
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How to Decrypt?
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- The receiver of the message needs to know the key and have access Cryptopad to decrypt the message.
- Copy/paste the encrypted text into the text area. Take care to select
the text including the prefix
- ^ENCMVSSTART^---------------------------------------------------
- and the suffix ^ENCMVSEND ^---------------------------------------------------
- Enter the encryption key which was used to encrypt the message.
- Press the "Decrypt" button.
WARNING: If you use the wrong key the browser may garble the page due to presense
of unprintable characters
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Cryptopad: How it works(For techies only )
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Cryptopad uses DES algorithm for the basic encryption of text.
A shared key is used to encrypt and decrypt the message i.e. the sender
and the receiver need to know the encryption key.
The HTML page contains an Java Applet which contanis the DES implementation
and exposes two methods one to encrypt and the message and other to decrypt
the message.
The basic DES encryptor generates the encrypted stream. Such a stream can contain
non printable characters, so the applet converts this byte stream into printable
characters by replacing the byte value and converting it to its hexadecimal string
value.
e.g. if the encrypted byte is 32 it is converted to 3332
33 is the hex representation of ASCII value of 3
The encrypted string is twice the size of the original string.
The applet adds prefix and suffix delimiters, carriage returns so that the
encrypted text can be copy/pasted into other application.
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