Dahna, McConnachie. «Bruce Almighty: Schneier preaches security to Linux faithful». Computerworld p. 3, 27-12-2007. [Consulta: 31 desembre 2007]. «At this point, though, I'm amazed it's still being used. If people ask, I recommend Twofish instead.»
Tom Gonzalez. «A Reflection Attack on Blowfish». Journal of LATEX Class Files, gener 2007. Arxivat de l'original el 2015-11-18. [Consulta: 17 novembre 2015].
«GnuPG Frequently Asked Questions». Arxivat de l'original el 2017-12-21. [Consulta: 26 gener 2018]. «Blowfish should not be used to encrypt files larger than 4Gb in size, but Twofish has no such restrictions.»
«GnuPG Frequently Asked Questions». Arxivat de l'original el 2017-12-21. [Consulta: 26 gener 2018]. «Blowfish should not be used to encrypt files larger than 4Gb in size, but Twofish has no such restrictions.»
Tom Gonzalez. «A Reflection Attack on Blowfish». Journal of LATEX Class Files, gener 2007. Arxivat de l'original el 2015-11-18. [Consulta: 17 novembre 2015].