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POHow to return and display the RSA ciphertext when encrypted in Java
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  1. POHow to return and display the RSA ciphertext when encrypted in Java
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    copied!<p>I am writing a simple java programs to encrypt/decrypt using DES and RSA algorithms using Java. In Java, in order to encrypt and decrypt using the function <code>doFinal</code>, I have to conver the message (plain text) into bytes. I used the function <code>.getBytes</code> to do so. Here is part of the code:</p> <pre><code>Cipher desCipher // Create the cipher desCipher = Cipher.getInstance("DES/ECB/NoPadding"); desCipher.init(Cipher.ENCRYPT_MODE, myDesKey); byte[] textEncrypted = desCipher.doFinal(msgBytes); </code></pre> <p>Then, return it as:</p> <pre><code>return new String(base64Cipher); </code></pre> <p>In this case, I get the cipher text looks in strange characters suc as:</p> <pre><code>Encrypted Message: °;zRfwجvë ‏“ëثw‰ڑل7دM#¼7وm‡î¤ </code></pre> <p>In some internet tutorials, they used Base64 encoding before returning the cipher such as this reference: <a href="http://techie-experience.blogspot.com/2012/10/encryption-and-decryption-using-aes.html" rel="nofollow">http://techie-experience.blogspot.com/2012/10/encryption-and-decryption-using-aes.html</a></p> <p>When I used Base64 as follows:</p> <p>byte[] textEncrypted = desCipher.doFinal(msgBytes);</p> <pre><code>// converts to base64 for easier display. byte[] base64Cipher = Base64.encodeBase64(textEncrypted); return new String(base64Cipher); </code></pre> <p>The cipher text appears in alpha and numerical characters as:</p> <pre><code>Encrypted Message: Xz93ODw3gEKm3hziPr0UJ+ed55nWLGpTR9uHjZjLwtg= </code></pre> <p>Which method is correct? Does RSA cipher supposed to be in alpha-numeric characters only? If not, why that referee suggests using it ? </p>
 

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