-1
votes
1answer
164 views

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 ...
0
votes
1answer
104 views

Significance of repetition in XOR cipher text

I'm attempting to recover plain-text (P1, P2) from two uneven cipher-text strings (C1, C2) that I suspect used the same key (K). When I XOR C1 and C2 together to obtain (P1+P2), there is repetition ...
0
votes
1answer
170 views

XOR cipher Pseudo-random key strength

When implementing a XOR cipher with a pseudo-random key equal in length to the plaintext, Is there a significant difference in potential key strength between keys drawn from a pool of either 1000 or ...