From an earlier revision of the article:
''For comparison, in 2001 some experts are suggesting these sizes for various public key systems for a security level appropriate to major business transactions that require secrecy:
RSA (based on difficulty of factorisation) 1024 bits.
DSA (based on difficulty of discrete log for integers modulo a prime) 1024 bits.
ECC (based on difficulty of discrete log for discrete ECC system) 200 bits.''
I have removed this until it can be backed up firmly by a cite - instead, I have added external links to research papers in this field. -- The Anome