Busy. Please wait.

show password
Forgot Password?

Don't have an account?  Sign up 

Username is available taken
show password


Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
We do not share your email address with others. It is only used to allow you to reset your password. For details read our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.

Remove ads
Don't know
remaining cards
To flip the current card, click it or press the Spacebar key.  To move the current card to one of the three colored boxes, click on the box.  You may also press the UP ARROW key to move the card to the "Know" box, the DOWN ARROW key to move the card to the "Don't know" box, or the RIGHT ARROW key to move the card to the Remaining box.  You may also click on the card displayed in any of the three boxes to bring that card back to the center.

Pass complete!

"Know" box contains:
Time elapsed:
restart all cards

Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

Crypto History

History of Crytography

Caeser Cipher Simple Substitution, Shift Characters 3 spaces, A=D, B=E, C=F...etc, Substitution Ciphers are subject to pattern analysis
Scytale Spartans used to communicate messages to generals in the fields, Wrapped tape around a rod, Diameter of the rod is the pre-agreed upon secret(key)
Vignere First polyalphabetic ciper, Key work is agreed upon ahead of time, first letter of the key is matched up against first letter of the message, and so on.
Vernam One Time Pad, Only mathematically unbreakable form of cryptography, key only used once, Pad as long a s message, unpredictable. Key Pad must be delivered and stored securely
Enigma Machine and Purple Machine Used by the Germans and Japanese in WWII, Breaking the cryptography of these devices is credited with reducing the length of the war.
Created by: Dks0512