** [https://en.wikipedia.org/wiki/International_Article_Number_(EAN) EAN]
** [https://en.wikipedia.org/wiki/Universal_Product_Code UPC]
* VarmenteetKryptografia: avaimet, varmenteet, tiivisteet, algoritmit:
** [[X.509]], [[Tekniikka/Varmenne|Varmenne]], [[Viro/Henkilökortti/Varmenne]], [[Tekniikka/Nordea|Nordea eID]]
** [https://cryptobook.nakov.com/ Practical Cryptography for Developers]
** [https://en.wikipedia.org/wiki/Certification_path_validation_algorithm Certification path validation algorithm]
** [https://luca.ntop.org/Teaching/Appunti/asn1.html A Layman's Guide to a Subset of ASN.1, BER, and DER]