Here's the challenge:
I created a file, Challenge. The plaintext for the file is composed mostly of one ASCII character with an additional sentence or two in English.
It is available here:
The SHA1 checksums for file is:
// // File Checksum Integrity Verifier version 2.05. // 8061c7e2c93e2acc62dcac4e1f2617b3ae7c7d22 Challenge
The plaintext and options file for this are no longer on my computer system.
Perhaps my inability to figure out how one would decrypt Yull-encrypted files without all the parameters only shows my ignorance of cryptography. Perhaps but maybe perhaps not.
With Yull I have strived to make it easy to protect your data and nearly impossible (really, I believe impossible but I can't say that) for an adversary to retrieve it without your cooperation.
I think I have succeeded, but of course, I cannot prove a negative.
You can read the White Paper here on the web site to learn how Yull works. Perhaps that's some help.
PROVE ME WRONG! SHOW ME YULL IS A FAILURE!
I will answer questions (if they are useful for the rest of the community) about these files.