Nortel "Entrust"

Can anyone tell me anything about a product called "Entrust", by Nortel (Northern Telecom). The notes talk about the software using DES ("which employs a 56-bit key") so I guess it's single DES, not triple DES. It also mentions a proprietary algorithm called CAST. Is this worthy of further investigation, or is it suspect ? What is CAST, and would it be classed as snake oil ? Please cc to me in mail - I have a little trouble dealing with the volume here. Sincerely, -Jon -- Jonathon Fletcher, "opinions are my own, not my employer's" jonathon@japan.sbi.com