Here are some tools ( for Vista / Seven minimum ) whose goal is to ease the use and understanding of cryptography involved in software and network security.
Some of them may be usefull in the daily life of testers or developpers.

All your comments are welcome : SecTools@free.fr
 
secret key and password CryptoSym-EN.zip
manual  screenshot
 
secret key exchange through unsecure network SharedSecret-EN.zip
manual  screenshots
 
generating public key PubKeyWiz-EN.zip
manual  screenshots
 
signing and verifying with public keys PubKeySign-EN.zip
manual  screenshot
 
a tool to make X509 certificates X509Builder-EN.zip
manual screenshot
 
to 'probe' a SSL/TLS server
TLS Cipher Suites
manual  screenshots
 
SRP Verifiers
SRP Verifiers-EN
manual  screenshots
 
a multithreaded TLS test server and client TLS Test Pack-EN
manual  screenshots
 
a multi-transcoder YAED-EN
manual  screenshot
or :
 
all the tools (dynamically linked) in one package : SecToolsSuite.zip
Depending of your computer configuration, you may also need the corresponding :
Microsoft C++ runtime components (x86)
 
  [very] usefull links :
Peter Gutmann's X509 style guide, [homepage],
CrypTool
Random.org
Key Length
 
And still about security ... :
 
last update : saturday, 18 february 2017