Windows theme changer. This command generates a cryptographically strong sequenceof pseudo random numbers.

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In order to generate a stream enter the desired stream sizein bytes and press OK. Spaces and commas in the numberfield are ignored; you can use them to format long numbers.

The resulting stream will be placed into the clipboard – usethe Paste command to insert it into a stream being edited,or paste it to another application like Windows Explorer.

Inside the Random Number Generator

The random stream is a sequence of 128-bit blocks. Each block isproduced by encrypting the previous block with the AES cipher. Theinitialization vector is used to produce the first block.

This implementation corresponds to the standard OFB (Output Feedback)encryption mode, that is applying the generated pseudo random stream toa plaintext will result the AES OFB encryption.

By default the program uses a zero initialization vector, and a randomencryption key produced by hashing the current time and the processor clockcounter values, thus generating different streams on every call.

Specifying Encryption Constants

You can set the initialization vector and the encryption key manually.You must specify at least the encryption key if you want to be able toreproduce the same encryption stream.

Enter the initialization vector as a hexadecimal 16 byte long value,separating bytes with spaces or commas. If you enter a shorter value,it will padded with zeros. If you enter more than 16 bytes, only the firstsixteen bytes will be used. Enter nothing if you wish to use the defaultzero vector.

The are two methods of specifying the encryption key. You can enterit either directly, or as a text password.

Enter a binary key by specifying up to 32 hexadecimal bytes. A shortervalue will be padded with zeros; a longer value will be truncated.

Enter a password as an arbitrary length text string. The actual 256-bitkey will be produced by hashing the string with the SHA-256 secure hash function.

Note that leaving the input field empty will cause generating a random key.

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Implementation for php 7.x was added

As you see this implementation is using openssl instead of mcrypt and the result of the encryption/decryption is not compatible with each other.
The mcrypt function will be deprecated feature in PHP 7.1.x

What is AES encryption?

It is a webtool to encrypt and decrypt text using AES encryption algorithm. You can chose 128, 192 or 256-bit long key size for encryption and decryption. The result of the process is downloadable in a text file.

How to use AES encryption?

If you want to encrypt a text put it in the white textarea above, set the key of the encryption then push the Encrypt button.
The result of the encryption will appear in base64 encoded to prevent character encoding problems.
If you want to decrypt a text be sure it is in base64 encoded and is encrypted with AES algorithm!
Put the encrypted text in the white textarea, set the key and push the Decrypt button.

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When is helpful to use AES encryption?

When you want to encrypt a confidential text into a decryptable format, for example when you need to send sensitive data in e-mail.
The decryption of the encrypted text it is possible only if you know the right password.

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What is AES encryption?

AES (acronym of Advanced Encryption Standard) is a symmetric encryption algorithm.
The algorithm was developed by two Belgian cryptographer Joan Daemen and Vincent Rijmen.
AES was designed to be efficient in both hardware and software, and supports a block length of 128 bits and key lengths of 128, 192, and 256 bits.

How secure is AES encryption algorithm?

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AES encryption is used by U.S. for securing sensitive but unclassified material, so we can say it is enough secure.