Cryptographic functions which transform plaintext into ciphertext or the other way around.

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SHA256-based stream cipher

Can anyone comment if the stream cipher described here is safe? The author claims it to be unbreakable, but does not provide any evidence or proof to support this. For completeness, I have reproduced ...
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Hash Based Encryption (fast & simple), how well would this compare to AES? [duplicate]

First of all, I know it's a very bad idea to invent your own encryption algorithm. It's better to use existing known, trusted, extensively tested and studied algorithms with a proven track record. The ...
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Substitution Cipher Help [closed]

I have the following ciphertext: w jaoot zhoipqjwp ql wee lro oawxaop I know it is a substitution cipher but using my frequency analysis skills does not help me to find the plaintext. I think the ...
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Why does my implementation of CBC mode only decrypt the first block correctly? [closed]

I have the following code that uses a CBC mode to encrypt a text by dividing it to 3-elements block. But it only works correctly on the first block which is xored with the IV. ...