Quick tip if you are trying to deploy Dovecot on RHEL6 or CentOS6 and get an error message about an 'unknown CA' like this:
SSL (Secure Sockets Layer) and its descendant TLS (Transport Layer Security) are the most widely used protocols for encrypting data that is exchanged between a server and a client. These protocols often use X.509 certificates and asymmetric cryptography. STARTTTLS is another method of securing plain-text communication. This protocol also encrypts data with SSL or TLS, Continue reading...
Convinced from spending hours reading rave reviews, Bob eagerly clicked "Proceed to Checkout" for his gallon of Tuscan Whole Milk and
Warning from Microsoft to the entire Internet: make sure that your digital certificates are at least 1024 bits. As of Oct. 9, 2012, longer key lengths are mandatory for all digital encryption certificates that touch Windows systems.This means that Internet Explorer will refuse to access websites that do not have RSA keys with minimum lengths of 1024 bits. You won't be able to exchange encrypted emails, run ActiveX controls or install applications on Windows. This isn't new, as Microsoft started making announcements about this well over a year ago.