Vista / Win2k / Win7 / Win8 / WinXP
The tool is incredibly lightweight at around 14KB (v22.214.171.124), and features support for the Rijndael Encryption Algorithm backed by the U.S. Government and used for classified information.
This portable tool requires no installation.
theletterencrypter encryption rijndael algorithm
1License and operating system information is based on latest version of the software.
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