From the Wikipedia article:
Solitaire leaks information at a rate of about 0.0005 bits per character. While its security may perhaps be adequate for very short messages, in general Solitaire is considered insecure.
See also: http://www.ciphergoth.org/crypto/solitaire/
From the Wikipedia article:
See also: http://www.ciphergoth.org/crypto/solitaire/