Question

A)

HASHES -
Meet at the safe
dock at 0600.
hash# A13F7E9

B) Meet at the safe
dock at 0600.
hash# 91C8F02

Answer 1

Do you want me to verify which of those two hex strings is the correct hash for the message, or to compute the hash of the message for a particular algorithm? If so, which hash algorithm should I use (CRC32, MD5, SHA‑1, SHA‑256, etc.) and exactly which bytes should be hashed (are the line breaks and any trailing newline included)?

If you just want to check them yourself, here are quick commands/snippets you can run. Note: hashes are extremely sensitive to exact bytes (line breaks, spaces, trailing newline, capitalization).

1) Python — CRC32 (common for short hex like yours)
- Copy exactly the message you mean into the string (preserve newlines). Example using the two-line message shown:
```
import binascii, hashlib

s = "Meet at the safe\ndock at 0600." # adjust if you have different line breaks or trailing newline
crc = binascii.crc32(s.encode('utf-8')) & 0xFFFFFFFF
print(hex(crc)[2:].upper()) # prints CRC32 as hex (no leading 0x), uppercase
print(hashlib.md5(s.encode()).hexdigest()) # md5
print(hashlib.sha1(s.encode()).hexdigest()) # sha1
print(hashlib.sha256(s.encode()).hexdigest())# sha256
```
Compare the printed CRC32 (8 hex digits) with your values. If your hashes are 7 digits, you may be missing a leading zero — e.g. 091C8F02 vs 91C8F02.

2) Linux / macOS — common tools
- MD5:
echo -n "Meet at the safe\ndock at 0600." | md5sum
- SHA1:
echo -n "Meet at the safe\ndock at 0600." | sha1sum
- SHA256:
echo -n "Meet at the safe\ndock at 0600." | sha256sum
- CRC32 (if you have cksum — note cksum prints decimal CRC):
echo -n "Meet at the safe\ndock at 0600." | cksum
(first number is decimal CRC32; convert to hex with printf '%08X' <number>)

3) Windows PowerShell
- SHA256:
- "Meet at the safe`ndock at 0600." | % { [System.Text.Encoding]::UTF8.GetBytes($_) } | % { [BitConverter]::ToString((New-Object Security.Cryptography.SHA256Managed).ComputeHash($_)) -replace '-' , '' }
(Or use Get-FileHash on a file.)

If you tell me:
- the exact bytes to hash (copy–paste the message as you intend, including line breaks and whether there's a trailing newline), and
- which algorithm you want (CRC32, MD5, SHA1, SHA256, etc.),

I can compute the hash and tell you whether A13F7E9 or 91C8F02 matches.