What does this signature look like?

Question

Cryptography

What does this signature look like? (algorithm options issuing 16 bytes)
HEX value: A69CEEB2445F8FF071CF55D12CE07BC7
I just don’t understand what can be 16 bytes long ...

Answer 1

A signature in a point-to-point channel (that is, between two subscribers sharing a secret known only to the two of them) can be implemented by symmetric cryptoalgorithms - a block cipher or a hash function: (Keyed-)MAC and (Keyed-)HMAC, respectively.
In the end, there are exotic asymmetric signatures in excess of small volume, for example, BLS

Answer 2

128 bit value. the most common case is MD5, although there may be more exotic MD2, MD4, and if it is symmetrically encrypted and not a hash, then, for example, AES.
Well, or any more rare exotic, you can’t know for sure without a code ...