# 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. ##### Topic 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. ##### Topic 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. ##### Topic References: >See [HMAC](https://en.wikipedia.org/wiki/HMAC) on Wikipedia for more information. ### XMSS Signatures ##### Topic 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. ##### Topic 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. ##### Topic References: >See [Triple DES](https://en.wikipedia.org/wiki/Triple_DES)on Wikipedia for more information. ### RSA RSA stands for **Rivest–Shamir–Adleman** cryptosystem. ##### Topic References: >See [RSA cryptosystem](https://en.wikipedia.org/wiki/RSA_cryptosystem) on Wikipedia for more information. ###### General References > (none yet) ###### Relevant Search Tags > #encryption