[Cryptography] Cryptography buzzword spotted in mundane life, and I don't know what it means

[John Levine]

It appears that Kent Borg <kentborg at borg.org> said:
>The "application cryptogram" is what caught my eye…a message from credit 
>card chip, its answer to some challenge?

It's a hash that the issuer can verify. Each EMV card has a unique
secret stored in its chip known to its card issuer. The cryptogram
depends on the shared secret and transaction details, so it prevents
replay attacks that you get with static info from a magstripe. Dunno
what the point is of printing it on the receipt.

This sort of explains it:

https://medium.com/@DEEPTHIMALLIDI/emv-cryptogram-arqc-explained-1fe2fed4440b

R's,
John