Vice Auth

Inspired by authentication mechanisms in modern malware, this challenge implements a cipher-based proof-of-work system.

You are provided with a compiled Linux binary that requires you to prove your understanding of the encryption algorithm. The binary contains multiple obfuscated values - analyze carefully to discover what you need to encrypt and how.

Binary Information:

Filename: vice
Size:     26,928 bytes (27 KB)
MD5:      419dd0292f1192bfe7619b7c427c5da2
SHA1:     4ddfed24236bf959c4ed95b80730bba94bf44a37
SHA256:   63791e556595096757e72be78812c9421853c1917a2af6ca59fdef39337568bc

Verify integrity after download:

md5sum vice
sha1sum vice
sha256sum vice