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I am implementing a small demo application which encrypts using AES CTR with OpenSSL is it possible to test the algorithm using different modes of operation test vectors for example testing the ECB vector in my application and check the result or is it restricted to ctr test vectors??? If it is restricted to test it with ctr can anybody provide me the ctr test vectors??? Many Thanks!!
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AES-CTR encryption is the XOR of the key stream with the plaintext. AES-CTR decryption is the XOR of the key stream with the ciphertext. If the generated key stream is longer than the plaintext or ciphertext, the extra key stream bits are simply discarded.
The way encryption works in AES CTR mode is that we generate some random bits with the encryption key provided and the IV. With these random bits we then XOR them with our string. This creates a randomized text.
Out of 128-bit, 192-bit, and 256-bit AES encryption, which progressively use more rounds of encryption for improved security, 128-bit AES encryption is technically the least secure.
AES algorithm requires two different parameters for encryption, a key and an initialization vector (IV).
NIST Special Pub 800-38A has test vectors for several modes of AES including CTR mode.
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