# Card Encryption Multiple encryption and signature systems are used across the Vertisan Card Ecosystem. Following are examples: #### AES 256 The AES 256 acronym stands for Advanced Encryption Standard, which is widely used for secure 256-bit data encryption. ###### References: See [Advanced Encryption Standard](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard) on Wikipedia for more information. #### AES 128 The AES 128 acronym stands for Advanced Encryption Standard, which is widely used for secure 128-bit data encryption. ###### References: See [Advanced Encryption Standard](https://en.wikipedia.org/wiki/Advanced_Encryption_Standard) on Wikipedia for more information. #### HMAC Signing In [cryptography](https://en.wikipedia.org/wiki/Cryptography "Cryptography"), an **HMAC** (sometimes expanded as either **keyed-hash message authentication code** or **hash-based message authentication code**) is a specific type of [message authentication code](https://en.wikipedia.org/wiki/Message_authentication_code "Message authentication code") (MAC) involving a [cryptographic hash function](https://en.wikipedia.org/wiki/Cryptographic_hash_function "Cryptographic hash function") and a secret cryptographic key. ###### References: See [HMAC](https://en.wikipedia.org/wiki/HMAC) on Wikipedia for more information. #### XMSS Signatures ###### References: See [Merkle signature scheme](https://en.wikipedia.org/wiki/Merkle_signature_scheme) on Wikipedia for more information. #### DES The DES acronym stands for Data Encryption Standard, which is an older symmetric-key method. ###### References: See [Data Encryption Standard](https://en.wikipedia.org/wiki/Data_Encryption_Standard)on Wikipedia for more information. #### Triple DES Triple DES is an enhancement of DES that applies the algorithm three times for increased security. ###### References: See [Triple DES](https://en.wikipedia.org/wiki/Triple_DES)on Wikipedia for more information. #### RSA ###### References: See [RSA cryptosystem](https://en.wikipedia.org/wiki/RSA_cryptosystem) on Wikipedia for more information.