Below are some problems related to computer security (specifically poorly implemented security). Do Them. You are free to use any language and environment you like to complete them. The problems require familiarity with programming, but not necessarily with applied cryptography or computer security in general. An understanding of how some of the algorithms and tools in the problems work will be of use, so as a starting point you can find some resources to help you begin here. If this topic is new to you, you may want to start with the Tutorial Problems.
Can you use PGP programmatically?
Can you read and use an OpenSSL RSA key?
Cut and Paste Attack On AES-ECB
Create a valid ciphertext without knowledge of the key using some copypasta.